//SCROLL.JS


//execution starts from here
	
self.onError=null;
	
currentX = currentY = 0;  

whichIt = null;           

lastScrollX = 0; lastScrollY = 0;
	
NS = (document.layers) ? 1 : 0;	// this is a ternary operator. It is nothing but a simple IF-ELSE condition
					// if condition given in bracket is TRUE then NS is assigned 1 or NS is assigned 0

IE = (document.all) ? 1: 0;		// same as above

if(NS)					// if NS is equal to 1 it means TRUE in C & JavaScript…in JavaScript you can use 
					// TRUE-FALSE words also to represent status
{
window.captureEvents(Event.MOUSEUP|Event.MOUSEDOWN);
	//window.onmousedown = grabIt;
	//window.onmousemove = moveIt;
	//window.onmouseup = dropIt;
}

if(IE)					// same as above
{
	//document.onmousedown = grabIt;
 	//document.onmousemove = moveIt;
	//document.onmouseup = dropIt;
}
	
if(NS || IE) 				// "||" means OR
// so if NS is equal to 1 or if IE is equal to 1, in any case this IF condition will pass as true
{
action = window.setInterval("heartBeat()",1);	// this is calling the heartbeat() function after every 1 microsecond
}
	
function heartBeat()
{
if(IE)
{
diffY = document.body.scrollTop; diffX = document.body.scrollLeft;
 }

	if(NS)
{
diffY = self.pageYOffset; diffX = self.pageXOffset;
}
		
	if(diffY != lastScrollY)
{
percent = .1 * (diffY - lastScrollY);

if(percent > 0)
{
percent = Math.ceil(percent);
		}
		else
{
percent = Math.floor(percent);
		}
		

if(IE)
{
document.all.floater.style.pixelTop += percent;
		}
		if(NS)
{
document.floater.top += percent; 
		}

	            lastScrollY = lastScrollY + percent;
}

	if(diffX != lastScrollX)
{
//percent = .1 * (diffX - lastScrollX);

//if(percent > 0)
//{
//percent = Math.ceil(percent);
//}
//else
//{
//percent = Math.floor(percent);
//}

//		if(IE)
//{
//document.all.floater.style.pixelLeft += percent;
//}

//if(NS)
//{
//document.floater.left += percent;
//}

//		lastScrollX = lastScrollX + percent;
	}
}
	
function checkFocus(x,y)
{ 
stalkerx = document.floater.pageX;
stalkery = document.floater.pageY;
stalkerwidth = document.floater.clip.width;
stalkerheight = document.floater.clip.height;

if( (x > stalkerx && x < (stalkerx+stalkerwidth)) && (y > stalkery && y < (stalkery+stalkerheight)))
{
return true;
	}
	else
{
return false;
}
}
	

function grabIt(e)
{
if(IE) 
{
whichIt = event.srcElement;
		while (whichIt.id.indexOf("floater") == -1)
{
			whichIt = whichIt.parentElement;
			if (whichIt == null)
{
return true;
}
}

		whichIt.style.pixelLeft = whichIt.offsetLeft;
		whichIt.style.pixelTop = whichIt.offsetTop;
		currentX = (event.clientX + document.body.scrollLeft);
	   	currentY = (event.clientY + document.body.scrollTop); 	
}
else
{ 
window.captureEvents(Event.MOUSEMOVE);
if(checkFocus (e.pageX,e.pageY))
{ 
whichIt = document.floater;
StalkerTouchedX = e.pageX-document.floater.pageX;
StalkerTouchedY = e.pageY-document.floater.pageY;
} 
}
	return true;
}
	
function moveIt(e)
{
if (whichIt == null)
{
return false;
}

	if(IE)
{
		newX = (event.clientX + document.body.scrollLeft);
		newY = (event.clientY + document.body.scrollTop);
		distanceX = (newX - currentX);    distanceY = (newY - currentY);
		currentX = newX;    currentY = newY;
		whichIt.style.pixelLeft += distanceX;
		whichIt.style.pixelTop += distanceY;

		if(whichIt.style.pixelTop < document.body.scrollTop)
{
whichIt.style.pixelTop = document.body.scrollTop;
		}
		
	if(whichIt.style.pixelLeft < document.body.scrollLeft)
{
whichIt.style.pixelLeft = document.body.scrollLeft;
		}

		if(whichIt.style.pixelLeft > document.body.offsetWidth - document.body.scrollLeft - whichIt.style.pixelWidth - 20) 
{
whichIt.style.pixelLeft = document.body.offsetWidth - whichIt.style.pixelWidth - 20;
		}
		if(whichIt.style.pixelTop > document.body.offsetHeight + document.body.scrollTop - whichIt.style.pixelHeight - 5) 
{
         whichIt.style.pixelTop = document.body.offsetHeight + document.body.scrollTop - whichIt.style.pixelHeight - 5;
}

		event.returnValue = false;
}
else
{ 
		whichIt.moveTo(e.pageX-StalkerTouchedX,e.pageY-StalkerTouchedY);

		if(whichIt.left < 0+self.pageXOffset)
{
whichIt.left = 0+self.pageXOffset;
		}

if(whichIt.top < 0+self.pageYOffset)
{
whichIt.top = 0+self.pageYOffset;
		}

if( (whichIt.left + whichIt.clip.width) >= (window.innerWidth+self.pageXOffset-17))
{
whichIt.left = ((window.innerWidth+self.pageXOffset)-whichIt.clip.width)-17;
		}

if( (whichIt.top + whichIt.clip.height) >= (window.innerHeight+self.pageYOffset-17))
{
whichIt.top = ((window.innerHeight+self.pageYOffset)-whichIt.clip.height)-17;
		}
return false;
}
	return false;
}
	
function dropIt()
{
whichIt = null;
	if(NS)
{
window.releaseEvents (Event.MOUSEMOVE);
	}
return true;
}