// JavaScript Document
var offsetfrommouse=[30,30]; //image x,y offsets from cursor position in pixels. Enter 0,0 for no offset
var displayduration=0; //duration in seconds image should remain visible. 0 for always.
var currentimageheight;
var currentimagewidth;
var imageEdgeBuffer = 50; //how far away from the edge of the browser window to stop the popup
var loadingImage = "img/loading.gif"; //the loading animation for the popup
var loadingImageWidth = "50px";
var loadingImageHeight = "50px";

if (document.getElementById || document.all){
	document.write('<div id="trailimageid">');
	document.write('</div>');
}

function gettrailobj(){
if (document.getElementById)
return document.getElementById("trailimageid").style
else if (document.all)
return document.all.trailimagid.style
}

function gettrailobjnostyle(){
if (document.getElementById)
return document.getElementById("trailimageid")
else if (document.all)
return document.all.trailimagid
}


function truebody(){
return (!window.opera && document.compatMode && document.compatMode!="BackCompat")? document.documentElement : document.body
}

function showtrail(imagename,width,height){

	if (height > 0){
		currentimageheight = height;
	}
	
	if (width > 0){
		currentimagewidth = width;
	}

	document.onmousemove=followmouse;

	imgPreloader = new Image();
	
	gettrailobjnostyle().innerHTML  = '<img id="loadingImage" src="' + loadingImage + '" border="0">'
	gettrailobj().height=loadingImageHeight;
	gettrailobj().width=loadingImageWidth;	

	imgPreloader.onload=function()
	{
		gettrailobj().height=currentimageheight+"px";
		gettrailobj().width=currentimagewidth+"px";
		gettrailobjnostyle().innerHTML = '<img src="' + imgPreloader.src + '" border="0">';
	}
	imgPreloader.src = imagename;
	
	gettrailobj().visibility="visible";
}


function hidetrail(){
	gettrailobj().visibility="hidden"
	document.onmousemove=""
	gettrailobj().left="-500px"
	gettrailobjnostyle().innerHTML = "";
	gettrailobj().height=loadingImageHeight;
	gettrailobj().width=loadingImageWidth;	

}

function followmouse(e){

	var xcoord=offsetfrommouse[0]
	var ycoord=offsetfrommouse[1]
	
	var docwidth=document.all? truebody().scrollLeft+truebody().clientWidth : pageXOffset+window.innerWidth-15
	var docheight=document.all? Math.min(truebody().scrollHeight, truebody().clientHeight) : Math.min(window.innerHeight)

	if (typeof e != "undefined"){ //firefox
		if (docwidth - e.pageX < currentimagewidth){
			xcoord = e.pageX - xcoord - width; // Move to the left side of the cursor
		} else {
			xcoord += e.pageX;
		}
		if (docheight - e.pageY < (currentimageheight + imageEdgeBuffer)){
			ycoord += e.pageY - Math.max(0,(imageEdgeBuffer + currentimageheight + e.pageY - docheight - truebody().scrollTop));
		} else {
			ycoord += e.pageY;
		}

	} else if (typeof window.event != "undefined"){ //IE
		if (docwidth - event.clientX < currentimagewidth){
			xcoord = event.clientX + truebody().scrollLeft - xcoord - currentimagewidth; // Move to the left side of the cursor
		} else {
			xcoord += truebody().scrollLeft+event.clientX
		}
		if (docheight - event.clientY < (currentimageheight + imageEdgeBuffer)){
			ycoord += event.clientY + truebody().scrollTop - Math.max(0,(imageEdgeBuffer + currentimageheight + event.clientY - docheight));
		} else {
			ycoord += truebody().scrollTop + event.clientY;
		}
	}
	

	var docwidth=document.all? truebody().scrollLeft+truebody().clientWidth : pageXOffset+window.innerWidth-15
	var docheight=document.all? Math.max(truebody().scrollHeight, truebody().clientHeight) : Math.max(document.body.offsetHeight, window.innerHeight)
	if(ycoord < 0) { ycoord = ycoord*-1; }
	
	gettrailobj().left=xcoord+"px"
	gettrailobj().top=ycoord+"px"

}