var contentHeight = 0;
var visibleContentHeight = 0;	
var scrollActive = false;

var scrollHandleObj = false; // reference to the scroll handle
var scrollHandleHeight = false;
var scrollbarTop = false;
var eventYPos = false;

var scrollbuttonActive = false;
var scrollbuttonDirection = false;
var scrollbuttonSpeed = 1; // How fast the content scrolls when you click the scroll buttons(Up and down arrows)
var scrollTimer = 10;	// Also how fast the content scrolls. By decreasing this value, the content will move faster	

var scrollMoveToActive = false;
var scrollMoveToYPosition = false;
function scrollDiv_startScroll(e){
	if(document.all)e = event;
	scrollbarTop = document.getElementById('scroll').offsetTop;
	eventYPos = e.clientY;
	scrollActive = true;
}
function scrollDiv_stopScroll(){
	scrollActive = false;
	scrollbuttonActive = false;
	scrollMoveToActive = false;
}
function scrollDiv_scroll(e)
{
	if(!scrollActive)return;
	if(document.all)e = event;
	if(e.button!=1 && document.all)return;
	var topPos = scrollbarTop + e.clientY - eventYPos; 
	if(topPos<0)topPos=0;
	if(topPos/1>visibleContentHeight-(scrollHandleHeight+4)/1)topPos = visibleContentHeight-(scrollHandleHeight+4);
	document.getElementById('scroll').style.top = topPos + 'px';
	document.getElementById('scrolldiv_content').style.top = 0 - Math.floor((contentHeight) * ((topPos)/(visibleContentHeight-scrollHandleHeight)))+'px' 
}

/*
Click on the slider
Move the content to the this point
*/
function scrolldiv_scrollMoveToInit(e)
{		
	if(document.all)e = event;
	scrollMoveToActive = true;
	scrollMoveToYPosition = e.clientY - document.getElementById('scrolldiv_scrollbar').offsetTop;
	if(document.getElementById('scroll').offsetTop/1 > scrollMoveToYPosition) scrollbuttonDirection = scrollbuttonSpeed*-2; else  scrollbuttonDirection = scrollbuttonSpeed*2;
	scrolldiv_scrollMoveTo();	
}

function scrolldiv_scrollMoveTo()
{
	if(!scrollMoveToActive || scrollActive)return;
	var topPos = document.getElementById('scroll').style.top.replace('px','');
	topPos = topPos/1 + scrollbuttonDirection;
	if(topPos<0){
		topPos=0;
		scrollMoveToActive=false;
	}
	if(topPos/1>visibleContentHeight-(scrollHandleHeight+4)/1){
		topPos = visibleContentHeight-(scrollHandleHeight+4);	
		scrollMoveToActive=false;
	}
	if(scrollbuttonDirection<0 && topPos<scrollMoveToYPosition-scrollHandleHeight/2)return;	
	if(scrollbuttonDirection>0 && topPos>scrollMoveToYPosition-scrollHandleHeight/2)return;			
	document.getElementById('scroll').style.top = topPos + 'px';
	document.getElementById('scrolldiv_content').style.top = 0 - Math.floor((contentHeight) * ((topPos)/(visibleContentHeight-scrollHandleHeight)))+'px' 		
	setTimeout('scrolldiv_scrollMoveTo()',scrollTimer);		
}

function cancelEvent()
{
	return false;			
}

function scrolldiv_scrollButton()
{
	if(this.id=='scrollDown')scrollbuttonDirection = scrollbuttonSpeed; else scrollbuttonDirection = scrollbuttonSpeed*-1;
	scrollbuttonActive=true;
	scrolldiv_scrollButtonScroll();
}
function scrolldiv_scrollButtonScroll()
{
	if(!scrollbuttonActive)return;
	var topPos = document.getElementById('scroll').style.top.replace('px','');
	topPos = topPos/1 + scrollbuttonDirection;
	if(topPos<0){
		topPos=0;
		scrollbuttonActive=false;
	}
	if(topPos/1>visibleContentHeight-(scrollHandleHeight+4)/1){
		topPos = visibleContentHeight-(scrollHandleHeight+4);	
		scrollbuttonActive=false;
	}	
	document.getElementById('scroll').style.top = topPos + 'px';
	document.getElementById('scrolldiv_content').style.top = 0 - Math.floor((contentHeight) * ((topPos)/(visibleContentHeight-scrollHandleHeight)))+'px' 			
	setTimeout('scrolldiv_scrollButtonScroll()',scrollTimer);
}
function scrolldiv_scrollButtonStop()
{
	scrollbuttonActive = false;
}


function scrolldiv_initScroll()
{
	visibleContentHeight = document.getElementById('scrolldiv_scrollbar').offsetHeight ;
	contentHeight = document.getElementById('scrolldiv_content').offsetHeight - visibleContentHeight;		
	scrollHandleObj = document.getElementById('scroll');
	scrollHandleHeight = scrollHandleObj.offsetHeight;
	scrollbarTop = document.getElementById('scrolldiv_scrollbar').offsetTop;		
	document.getElementById('scroll').onmousedown = scrollDiv_startScroll;
	document.body.onmousemove = scrollDiv_scroll;
	document.getElementById('scrolldiv_scrollbar').onselectstart = cancelEvent;
	document.getElementById('scroll').onmouseup = scrollDiv_stopScroll;
	if(document.all)document.body.onmouseup = scrollDiv_stopScroll; else document.documentElement.onmouseup = scrollDiv_stopScroll;
	document.getElementById('scrollDown').onmousedown = scrolldiv_scrollButton;
	document.getElementById('scrollUp').onmousedown = scrolldiv_scrollButton;
	document.getElementById('scrollDown').onmouseup = scrolldiv_scrollButtonStop;
	document.getElementById('scrollUp').onmouseup = scrolldiv_scrollButtonStop;
	document.getElementById('scrollUp').onselectstart = cancelEvent;
	document.getElementById('scrollDown').onselectstart = cancelEvent;
	document.getElementById('scrolldiv_scrollbar').onmousedown = scrolldiv_scrollMoveToInit;
}
/*
Change from the default color
*/	
function scrolldiv_setColor(rgbColor)
{
	document.getElementById('scrolldiv_scrollbar').style.borderColor = rgbColor;
	document.getElementById('scroll').style.backgroundColor = rgbColor;
	document.getElementById('scrollUp').style.borderColor = rgbColor;
	document.getElementById('scrollDown').style.borderColor = rgbColor;
	document.getElementById('scrollUp').style.color = rgbColor;
	document.getElementById('scrollDown').style.color = rgbColor;
	document.getElementById('scrolldiv_parentContainer').style.borderColor = rgbColor;
}
/*
Setting total width of scrolling div
*/
function scrolldiv_setWidth(newWidth)
{
	document.getElementById('scrolldiv').style.width = newWidth + 'px';
	document.getElementById('scrolldiv_parentContainer').style.width = newWidth-30 + 'px';		
}

/*
Setting total height of scrolling div
*/
function scrolldiv_setHeight(newHeight)
{
	document.getElementById('scrolldiv').style.height = newHeight + 'px';
	document.getElementById('scrolldiv_parentContainer').style.height = newHeight + 'px';
	document.getElementById('scrolldiv_slider').style.height = newHeight + 'px';
	document.getElementById('scrolldiv_scrollbar').style.height = newHeight-40 + 'px';		
}
/*
Setting new background color to the slider 
*/
function setSliderBgColor(rgbColor)
{
	document.getElementById('scrolldiv_scrollbar').style.backgroundColor = rgbColor;
	document.getElementById('scrollUp').style.backgroundColor = rgbColor;
	document.getElementById('scrollDown').style.backgroundColor = rgbColor;
}
/*
Setting new content background color
*/
function setContentBgColor(rgbColor)
{
	document.getElementById('scrolldiv_parentContainer').style.backgroundColor = rgbColor;
}

/*
Setting scroll button speed
*/
function setScrollButtonSpeed(newScrollButtonSpeed)
{
	scrollbuttonSpeed = newScrollButtonSpeed;
}
/*
Setting interval of the scroll
*/
function setScrollTimer(newInterval)
{
	scrollTimer = newInterval;
}