var VSA_scrollAreas = new Array();



var VSA_default_imagesPath = "images";

var VSA_default_btnUpImage = "button-up.gif";

var VSA_default_btnDownImage = "button-down.gif";

var VSA_default_scrollStep = 5;

var VSA_default_wheelSensitivity = 10;

var VSA_default_scrollbarPosition = 'right';//'left','right','inline';

var VSA_default_scrollButtonHeight = 2;

var VSA_default_scrollbarWidth = 11;



var VSA_resizeTimer = 2000;



if (window.addEventListener)

	window.addEventListener("load", VSA_initScrollbars, false);

else if (window.attachEvent)

	window.attachEvent("onload", VSA_initScrollbars);



function VSA_initScrollbars()

{

	var scrollElements = VSA_getElements("scrollable", "DIV", document, "class");

	for (var i=0; i<scrollElements.length; i++)

	{

		VSA_scrollAreas[i] = new ScrollArea(i, scrollElements[i]);

	}

}



function ScrollArea(index, elem) //constructor

{

	this.index = index;

	this.element = elem;



	var attr = this.element.getAttribute("imagesPath");

	this.imagesPath = attr ? attr : VSA_default_imagesPath;



	attr = this.element.getAttribute("btnUpImage");

	this.btnUpImage = attr ? attr : VSA_default_btnUpImage;



	attr = this.element.getAttribute("btnDownImage");

	this.btnDownImage = attr ? attr : VSA_default_btnDownImage;



	attr = Number(this.element.getAttribute("scrollStep"));

	this.scrollStep = attr ? attr : VSA_default_scrollStep;



	attr = Number(this.element.getAttribute("wheelSensitivity"));

	this.wheelSensitivity = attr ? attr : VSA_default_wheelSensitivity;



	attr = this.element.getAttribute("scrollbarPosition");

	this.scrollbarPosition = attr ? attr : VSA_default_scrollbarPosition;

	

	attr = this.element.getAttribute("scrollButtonHeight");

	this.scrollButtonHeight = attr ? attr : VSA_default_scrollButtonHeight;



	attr = this.element.getAttribute("scrollbarWidth");

	this.scrollbarWidth = attr ? attr : VSA_default_scrollbarWidth;



	this.scrolling = false;



	this.iOffsetY = 0;

	this.scrollHeight = 0;

	this.scrollContent = null;

	this.scrollbar = null;

	this.scrollup = null;

	this.scrolldown = null;

	this.scrollslider = null;

	this.scroll = null;

	this.enableScrollbar = false;

	this.scrollFactor = 1;

	this.scrollingLimit = 0;

	this.topPosition = 0;



	//functions declaration

	this.init = VSA_init;

	this.scrollUp = VSA_scrollUp;

	this.scrollDown = VSA_scrollDown;

	this.createScrollBar = VSA_createScrollBar;

	this.scrollIt = VSA_scrollIt;



	this.init();

	

}





function VSA_init()

{



	this.scrollContent = document.createElement("DIV");

	this.scrollContent.style.position = "absolute";

	this.scrollContent.innerHTML = this.element.innerHTML;

	this.scrollContent.style.overflow = "hidden";	



	this.scrollContent.style.width = this.element.offsetWidth + "px";

	this.scrollContent.style.height = this.element.offsetHeight + "px";



	

	this.element.innerHTML = "";

	this.element.style.overflow = "hidden";

	this.element.style.display = "block";

	this.element.style.visibility = "visible";

	this.element.style.position = "relative";

	this.element.appendChild(this.scrollContent);



	this.scrollContent.className = 'scroll-content';



	this.element.index = this.index;

	this.element.over = false;

	

	var _this = this;

	this.element.onmouseover = function(){

        _this.element.over = true;

    };

    this.element.onmouseout = function(){

        _this.element.over = false;

    }



	if (document.all)

	{

		this.element.onscroll = VSA_handleOnScroll;

		this.element.onresize = VSA_handleResize;

	}

	else

	{

		window.onresize = VSA_handleResize;

	}

	

	this.createScrollBar();

	

	if (window.addEventListener)

        /** DOMMouseScroll is for mozilla. */

        this.element.addEventListener('DOMMouseScroll', VSA_handleMouseWheel, false);

	/** IE/Opera. */

	this.element.onmousewheel = document.onmousewheel = VSA_handleMouseWheel;



}



function VSA_createScrollBar()

{



	if (this.scrollbar != null)

	{

		this.element.removeChild(this.scrollbar);

		this.scrollbar = null;

	}



	if (this.scrollContent.scrollHeight <= this.scrollContent.offsetHeight)

		this.enableScrollbar = false;

	else if (this.element.offsetHeight > 2*this.scrollButtonHeight)

		this.enableScrollbar = true;

	else

		this.enableScrollbar = false;



	if (this.scrollContent.scrollHeight - Math.abs(this.scrollContent.scrollTop) < this.element.offsetHeight)

		this.scrollContent.style.top = 0;



	if (this.enableScrollbar)

	{



		this.scrollbar = document.createElement("DIV");

		this.element.appendChild(this.scrollbar);		

		this.scrollbar.style.position = "absolute";

		this.scrollbar.style.top = "0px";

		this.scrollbar.style.height = this.element.offsetHeight+"px";

		this.scrollbar.style.width = this.scrollbarWidth + "px";



		this.scrollbar.className = 'vscroll-bar';



		if(this.scrollbarWidth != this.scrollbar.offsetWidth)

		{

			this.scrollbarWidth = this.scrollbar.offsetHeight;

		}

		

		this.scrollbarWidth = this.scrollbar.offsetWidth;



		if(this.scrollbarPosition == 'left')

		{

			this.scrollContent.style.left = this.scrollbarWidth + 5 + "px";			

			this.scrollContent.style.width = this.element.offsetWidth - this.scrollbarWidth - 5 + "px";			

		}

		else if(this.scrollbarPosition == 'right')

		{

			this.scrollbar.style.left = this.element.offsetWidth - this.scrollbarWidth  + "px";

			this.scrollContent.style.width = this.element.offsetWidth - this.scrollbarWidth - 5 + "px";			

		}



		//create scroll up button

		this.scrollup = document.createElement("DIV");

		this.scrollup.index = this.index;

		this.scrollup.onmousedown = VSA_handleBtnUpMouseDown;

		this.scrollup.onmouseup = VSA_handleBtnUpMouseUp;

		this.scrollup.onmouseout = VSA_handleBtnUpMouseOut;

		this.scrollup.style.position = "absolute";

		this.scrollup.style.top = "0px";

		this.scrollup.style.left = "0px";		

		this.scrollup.style.height = this.scrollButtonHeight + "px";		

		this.scrollup.style.width = this.scrollbarWidth + "px";

		

		/*this.scrollup.innerHTML = '<img src="' + this.imagesPath + '/' + this.btnUpImage + '" border="0"/>';*/

		this.scrollbar.appendChild(this.scrollup);



		this.scrollup.className = 'vscroll-up';



		if(this.scrollButtonHeight != this.scrollup.offsetHeight)

		{

			this.scrollButtonHeight = this.scrollup.offsetHeight;

		}

				

		//create scroll down button

		this.scrolldown = document.createElement("DIV");

		this.scrolldown.index = this.index;

		this.scrolldown.onmousedown = VSA_handleBtnDownMouseDown;

		this.scrolldown.onmouseup = VSA_handleBtnDownMouseUp;

		this.scrolldown.onmouseout = VSA_handleBtnDownMouseOut;

		this.scrolldown.style.position = "absolute";

		this.scrolldown.style.left = "0px";		

		this.scrolldown.style.top =  this.scrollbar.offsetHeight - this.scrollButtonHeight + "px";

		this.scrolldown.style.width = this.scrollbarWidth + "px";

		/*this.scrolldown.innerHTML = '<img src="' + this.imagesPath + '/' + this.btnDownImage + '" border="0"/>';*/

		this.scrollbar.appendChild(this.scrolldown);



		this.scrolldown.className = 'vscroll-down';



		//create scroll

		this.scroll = document.createElement("DIV");

		this.scroll.index = this.index;

		this.scroll.style.position = "absolute";

		this.scroll.style.zIndex = 0;

		this.scroll.style.textAlign = "center";

		this.scroll.style.top = this.scrollButtonHeight + "px";

		this.scroll.style.left = "0px";		

		this.scroll.style.width = this.scrollbarWidth + "px";

		

		var h = this.scrollbar.offsetHeight - 2*this.scrollButtonHeight;

		this.scroll.style.height = ((h > 0) ? h : 0) + "px";

		

		this.scroll.innerHTML = '';

		this.scroll.onclick = VSA_handleScrollbarClick;

		this.scrollbar.appendChild(this.scroll);

		this.scroll.style.overflow = "hidden";



		this.scroll.className = "vscroll-line";



		//create slider

		this.scrollslider = document.createElement("DIV");

		this.scrollslider.index = this.index;

		this.scrollslider.style.position = "absolute";

		this.scrollslider.style.zIndex = 1000;

		this.scrollslider.style.textAlign = "center";

		this.scrollslider.innerHTML = '<div id="scrollslider' + this.index + '" style="padding:0;margin:0;"><div class="scroll-bar-top"></div><div class="scroll-bar-bottom"></div></div>';

		this.scrollbar.appendChild(this.scrollslider);

		

		this.subscrollslider = document.getElementById("scrollslider"+this.index);		

		this.subscrollslider.style.height = Math.round((this.scrollContent.offsetHeight/this.scrollContent.scrollHeight)*(this.scrollbar.offsetHeight - 2*this.scrollButtonHeight)) + "px";

		

		this.scrollslider.className = "vscroll-slider";

		

		this.scrollHeight = this.scrollbar.offsetHeight - 2*this.scrollButtonHeight - this.scrollslider.offsetHeight;

		this.scrollFactor = (this.scrollContent.scrollHeight - this.scrollContent.offsetHeight)/this.scrollHeight;

		this.topPosition = getRealTop(this.scrollbar) + this.scrollButtonHeight;

		/* this.scrollbarHeight = this.scrollbar.offsetHeight - 2*this.scrollButtonHeight - this.scrollslider.offsetHeight; */



		this.scrollslider.style.top = 1 / this.scrollFactor * Math.abs(this.scrollContent.scrollTop) + this.scrollButtonHeight + "px";

		this.scrollslider.style.left = "0px";

		this.scrollslider.style.width = "100%";

		this.scrollslider.onmousedown = VSA_handleSliderMouseDown;

		if (document.all)

			this.scrollslider.onmouseup = VSA_handleSliderMouseUp;

	}

	else

		this.scrollContent.style.width = this.element.offsetWidth + "px";

}



function VSA_handleBtnUpMouseDown()

{

	var sa = VSA_scrollAreas[this.index];

	sa.scrolling = true;

	sa.scrollUp();

}



function VSA_handleBtnUpMouseUp()

{

	VSA_scrollAreas[this.index].scrolling = false;

}



function VSA_handleBtnUpMouseOut()

{

	VSA_scrollAreas[this.index].scrolling = false;

}



function VSA_handleBtnDownMouseDown()

{

	var sa = VSA_scrollAreas[this.index];

	sa.scrolling = true;

	sa.scrollDown();

}



function VSA_handleBtnDownMouseUp()

{

	VSA_scrollAreas[this.index].scrolling = false;

}



function VSA_handleBtnDownMouseOut()

{

	VSA_scrollAreas[this.index].scrolling = false;

}



function VSA_scrollIt()

{

	this.scrollContent.scrollTop = this.scrollFactor * ((this.scrollslider.offsetTop + this.scrollslider.offsetHeight/2) - this.scrollButtonHeight - this.scrollslider.offsetHeight/2);

}



function VSA_scrollUp()

{

	if (this.scrollingLimit > 0)

	{

		this.scrollingLimit--;

		if (this.scrollingLimit == 0) this.scrolling = false;

	}

	if (!this.scrolling) return;

	if ( this.scrollContent.scrollTop - this.scrollStep > 0)

	{

		this.scrollContent.scrollTop -= this.scrollStep;

		this.scrollslider.style.top = 1 / this.scrollFactor * Math.abs(this.scrollContent.scrollTop) + this.scrollButtonHeight + "px";

	}

	else

	{

		this.scrollContent.scrollTop = "0";

		this.scrollslider.style.top = this.scrollButtonHeight + "px";

		return;

	}

	setTimeout("VSA_Ext_scrollUp(" + this.index + ")", 30);

}



function VSA_Ext_scrollUp(index)

{

	VSA_scrollAreas[index].scrollUp();

}



function VSA_scrollDown()

{

	if (this.scrollingLimit > 0)

	{

		this.scrollingLimit--;

		if (this.scrollingLimit == 0) this.scrolling = false;

	}

	if (!this.scrolling) return;





	this.scrollContent.scrollTop += this.scrollStep;

	this.scrollslider.style.top =  1 / this.scrollFactor * Math.abs(this.scrollContent.scrollTop) + this.scrollButtonHeight + "px";



	if (this.scrollContent.scrollTop >= (this.scrollContent.scrollHeight - this.scrollContent.offsetHeight))

	{

		this.scrollContent.scrollTop = (this.scrollContent.scrollHeight - this.scrollContent.offsetHeight);

		this.scrollslider.style.top = this.scrollbar.offsetHeight - this.scrollButtonHeight - this.scrollslider.offsetHeight + "px";

		return;

	}



	setTimeout("VSA_Ext_scrollDown(" + this.index + ")", 30);

}



function VSA_Ext_scrollDown(index)

{

	VSA_scrollAreas[index].scrollDown();

}



function VSA_handleMouseMove(evt)

{

	var sa = VSA_scrollAreas[((document.all && !window.opera) ? this.index : document.documentElement.scrollAreaIndex)];

	var posy = 0;

	if (!evt) var evt = window.event;

	

	if (evt.pageY)

		posy = evt.pageY;

	else if (evt.clientY)

		posy = evt.clientY;

			

		if (document.all && !window.opera)

		{

			posy += document.documentElement.scrollTop;

		}



	var iNewY = posy - sa.iOffsetY - sa.topPosition;

		iNewY += sa.scrollButtonHeight;

		

	if (iNewY < sa.scrollButtonHeight)

		iNewY = sa.scrollButtonHeight;

	if (iNewY > (sa.scrollbar.offsetHeight - sa.scrollButtonHeight) - sa.scrollslider.offsetHeight)

		iNewY = (sa.scrollbar.offsetHeight - sa.scrollButtonHeight) - sa.scrollslider.offsetHeight;



	sa.scrollslider.style.top = iNewY + "px";



	sa.scrollIt();

}



function VSA_handleSliderMouseDown(evt)

{

	if (!(document.uniqueID && document.compatMode && !window.XMLHttpRequest))

	{

		document.onselectstart = function() { return false; }

		document.onmousedown = function() { return false; }

	}



	var sa = VSA_scrollAreas[this.index];

	if (document.all && !window.opera)

	{

		sa.scrollslider.setCapture()

		sa.iOffsetY = event.offsetY;

		sa.scrollslider.onmousemove = VSA_handleMouseMove;

	}

	else

	{

		if(window.opera)

		{

			sa.iOffsetY = event.offsetY;

		}

		else

		{

			sa.iOffsetY = evt.layerY;

		}

		document.documentElement.scrollAreaIndex = sa.index;

		document.documentElement.addEventListener("mousemove", VSA_handleMouseMove, true);

		document.documentElement.addEventListener("mouseup", VSA_handleSliderMouseUp, true);

	}

	return false;

}



function VSA_handleSliderMouseUp()

{

	if (!(document.uniqueID && document.compatMode && !window.XMLHttpRequest))

	{

		document.onmousedown = null;

		document.onselectstart = null;

	}



	if (document.all && !window.opera)

	{

		var sa = VSA_scrollAreas[this.index];

		sa.scrollslider.onmousemove = null;

		sa.scrollslider.releaseCapture();

		sa.scrollIt();

	}

	else

	{

		var sa = VSA_scrollAreas[document.documentElement.scrollAreaIndex];

		document.documentElement.removeEventListener("mousemove", VSA_handleMouseMove, true);

		document.documentElement.removeEventListener("mouseup", VSA_handleSliderMouseUp, true);

		sa.scrollIt();

	}

	return false;

}



function VSA_handleResize()

{

	if (VSA_resizeTimer)

	{

		clearTimeout(VSA_resizeTimer);

		VSA_resizeTimer = 0;

	}

	VSA_resizeTimer = setTimeout("VSA_performResizeEvent()", 100);

}



function VSA_performResizeEvent()

{

	for (var i=0; i<VSA_scrollAreas.length; i++)

		VSA_scrollAreas[i].createScrollBar();

}

function VSA_handleMouseWheel(event){

	if (this.index != null) {

		var sa = VSA_scrollAreas[this.index];

		

		if (sa.scrollbar == null) return;

		sa.scrolling = true;

		sa.scrollingLimit = sa.wheelSensitivity;

		

        var delta = 0;

        if (!event) /* For IE. */

                event = window.event;

        if (event.wheelDelta) { /* IE/Opera. */

                delta = event.wheelDelta/120;

                 

                /*if (window.opera)

                        delta = -delta;*/

        } else if (event.detail) { /** Mozilla case. */

                delta = -event.detail/3;

        }

        if (delta && sa.element.over) {

                if (delta > 0)

			        sa.scrollUp();

				else

			        sa.scrollDown();

				

                if (event.preventDefault)

                        event.preventDefault();

                event.returnValue = false;

        }

	}

}



function VSA_handleSelectStart()

{

	event.returnValue = false;

}



function VSA_handleScrollbarClick(evt)

{

	var sa = VSA_scrollAreas[this.index];

	var offsetY = (document.all ? event.offsetY : evt.layerY);

	

	if (offsetY < (sa.scrollButtonHeight + sa.scrollslider.offsetHeight/2))

		sa.scrollslider.style.top = sa.scrollButtonHeight + "px";

	else if (offsetY > (sa.scrollbar.offsetHeight - sa.scrollButtonHeight - sa.scrollslider.offsetHeight))

		sa.scrollslider.style.top = sa.scrollbar.offsetHeight - sa.scrollButtonHeight - sa.scrollslider.offsetHeight + "px";

	else

	{

		sa.scrollslider.style.top = offsetY + sa.scrollButtonHeight - sa.scrollslider.offsetHeight/2 + "px";

	}

	sa.scrollIt();

}



function VSA_handleOnScroll()

{

	//event.srcElement.doScroll("pageUp");

}



//--- common functions ----



function VSA_getElements(attrValue, tagName, ownerNode, attrName) //get Elements By Attribute Name

{

	if (!tagName) tagName = "*";

	if (!ownerNode) ownerNode = document;

	if (!attrName) attrName = "name";

	var result = [];

	var nl = ownerNode.getElementsByTagName(tagName);

	for (var i=0; i<nl.length; i++)

	{

	//	if (nl.item(i).getAttribute(attrName) == attrValue)

//		result.push(nl.item(i));

		if (nl.item(i).className.indexOf(attrValue) != -1)

		result.push(nl.item(i));

	}

	return result;

}



var _ie = false;

if(navigator.userAgent.toLowerCase().indexOf("msie") != -1 && navigator.userAgent.toLowerCase().indexOf("opera") == -1) _ie = true;



function getRealTop(elem)

{

	if(_ie) {

		var nTop = 0;

		if(elem)

		{

			do

			{

				nTop += elem.offsetTop - elem.scrollTop;

				elem = elem.offsetParent;

			}

			while(elem)

		}

		return nTop;

	}

	else {

		var posTop = 0;

		while (elem.offsetParent) {

			posTop += elem.offsetTop;

			elem = elem.offsetParent;

		}

		var _res = new Object();

		return posTop;

	}

}