var offsetfrommouse=[15,25];
var displayduration=0;

var defaultimageheight = 40;
var defaultimagewidth = 40;

var timer;

function gettrailobj()
{
if (document.getElementById)
return document.getElementById("preview_div").style;
}

function gettrailobjnostyle()
{
if (document.getElementById)
return document.getElementById("preview_div");
}


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


function hidetrail()
{	
	gettrailobj().display= "none";
	document.onmousemove="";
	gettrailobj().left="-1000px";
	clearTimeout(timer);
}


function showtrail(imagename,title,width,height)
{
	i = imagename;
	t = title;
	w = width;
	h = height;
	timer = setTimeout("show('"+i+"',t,w,h);",100);
}

function show(imagename,title,width,height)
{
 
  var docwidth=document.all? truebody().scrollLeft+truebody().clientWidth : pageXOffset+window.innerWidth - offsetfrommouse[0];
	var docheight=document.all? Math.min(truebody().scrollHeight, truebody().clientHeight) : Math.min(window.innerHeight);

	if( (navigator.userAgent.indexOf("Konqueror")==-1  || navigator.userAgent.indexOf("Firefox")!=-1 || (navigator.userAgent.indexOf("Opera")==-1 && navigator.appVersion.indexOf("MSIE")!=-1)) && (docwidth>650 && docheight>500)) 
	{
		( width == 0 ) ? width = defaultimagewidth: '';
		( height == 0 ) ? height = defaultimageheight: '';
			
		//width+=30;
		//height+=30;
		defaultimageheight = height;
		defaultimagewidth = width;
	
		document.onmousemove=followmouse; 
		
		newHTML = '<div class="border_preview" style="width:'+ width +'px;height:'+ height +'px">' + 
		          '<div id="loader_container">' + 
							'<div id="loader">' + 
							'<div align="center">Loading image preview...</div>' + 
							'<div id="loader_bg">' + 
							'<div id="progress">' + 
							'</div>' + 
							'</div>' + 
							'</div>' + 
							'</div>';
							
		//newHTML = newHTML + '<h2 class="title_h2">' + title + '</h2>';
		
    newHTML = newHTML + '<div class="preview_temp_load"><img onload="javascript:remove_loading();" src="' + imagename + '" border="0"></div>';
		newHTML = newHTML + '</div>'; 
		
		if(navigator.userAgent.indexOf("MSIE")!=-1 && navigator.userAgent.indexOf("Opera")==-1 )
		{
			newHTML = newHTML + '<iframe src="about:blank" scrolling="no" frameborder="0" width="'+width+'" height="'+height+'"></iframe>';
		}		

		gettrailobjnostyle().innerHTML = newHTML;
		gettrailobj().display="block";
	}
}

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")
	{
		if (docwidth - e.pageX < defaultimagewidth + 2*offsetfrommouse[0])
		{
			xcoord = e.pageX - xcoord - defaultimagewidth;
		} else {
			xcoord += e.pageX;
		}
		if (docheight - e.pageY < defaultimageheight + 2*offsetfrommouse[1])
		{
			ycoord += e.pageY - Math.max(0,(2*offsetfrommouse[1] + defaultimageheight + e.pageY - docheight - truebody().scrollTop));
		} else {
			ycoord += e.pageY;
		}

	} else if (typeof window.event != "undefined")
	{
		if (docwidth - event.clientX < defaultimagewidth + 2*offsetfrommouse[0])
		{
			xcoord = event.clientX + truebody().scrollLeft - xcoord - defaultimagewidth;
			
		} else {
			xcoord += truebody().scrollLeft+event.clientX;
		}
		if (docheight - event.clientY < (defaultimageheight + 2*offsetfrommouse[1]))
		{
			ycoord += event.clientY + truebody().scrollTop - Math.max(0,(2*offsetfrommouse[1] + defaultimageheight + event.clientY - docheight));
		} else {
			ycoord += truebody().scrollTop + event.clientY;
		}
	}
	gettrailobj().left=xcoord+"px";
	gettrailobj().top=ycoord+"px";

}