var offsetfrommouse=[5,0]; //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 = 430;	// maximum image size.

var currentimagewidth = 430;	// maximum image size.
var timer;

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

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


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


function hidetrail()
{	
	gettrailobj().display= "none";
	document.onmousemove=""
	gettrailobj().left="-500px"
	clearTimeout(timer);
	
}

function showtrail(imagename,title,showthumb,file_img)
{
	var i,t,s,f;
	i = imagename
	t = title
	s = showthumb
	f = file_img
	timer = setTimeout("show('"+i+"',t,s,f);",200);
}

function show(imagename,title,showthumb,file_img)
{
        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("Firefox")!=-1 || (navigator.userAgent.indexOf("Opera")==-1 && navigator.appVersion.indexOf("MSIE")!=-1)) && (docwidth>650 && docheight>500))
{
	document.onmousemove=followmouse; 
		
	if(file_img==1)
	{
		newHTML = '<div id="contenedor"></div>';
		newHTML =  newHTML +'<iframe scrolling="no" frameborder="0" src="../includes/imagen.php?titulo=' + title + '&imagen=' + imagename + '" width="305" height="346" style="visibility:hidden;" onload="javascript: document.getElementById(\'contenedor\').style.display=\'none\';document.getElementById(\'contenedor\').style.visibility=\'hidden\';this.style.visibility=\'visible\'"></iframe>';
	}
	else
	{
		newHTML = '<div id="contenedor"></div>';
		newHTML =  newHTML +'<iframe scrolling="no" frameborder="0" src="../includes/imagen.php?titulo=' + title + '&imagen=' + imagename + '" width="305" height="346" style="visibility:hidden;" onload="javascript: document.getElementById(\'contenedor\').style.display=\'none\';document.getElementById(\'contenedor\').style.visibility=\'hidden\';this.style.visibility=\'visible\'"></iframe>';
	}
	
	if(navigator.userAgent.indexOf("Firefox")==-1)
	{	
		//newHTML = newHTML+'<iframe src="about:blank" scrolling="no" frameborder="0" width="400" height="400"></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 - offsetfrommouse[0]
	var docheight=document.all? Math.min(truebody().scrollHeight, truebody().clientHeight) : Math.min(window.innerHeight)

	if (typeof e != "undefined"){
		if (docwidth - e.pageX < currentimagewidth){

		if(navigator.userAgent.indexOf("Firefox")!=-1)	{xcoord = e.pageX - xcoord - currentimagewidth + 2*offsetfrommouse[0]} else{ xcoord = e.pageX - xcoord - currentimagewidth + 6*offsetfrommouse[0] ;} // Move to the left side of the cursor
		} else {
			xcoord += e.pageX;
		}
		if (docheight - e.pageY < (currentimageheight + 110)){
			ycoord += e.pageY - Math.max(0,(110 + currentimageheight + e.pageY - docheight - truebody().scrollTop));
		} else {
			ycoord += e.pageY;
		}

	} else if (typeof window.event != "undefined"){
		if (docwidth - event.clientX < currentimagewidth){
			xcoord = event.clientX + truebody().scrollLeft - xcoord - currentimagewidth + 2*offsetfrommouse[0]; // Move to the left side of the cursor
		} else {
			xcoord += truebody().scrollLeft+event.clientX
		}
		if (docheight - event.clientY < (currentimageheight + 110)){
			ycoord += event.clientY + truebody().scrollTop - Math.max(0,(110 + currentimageheight + event.clientY - docheight));
		} else {
			ycoord += truebody().scrollTop + event.clientY;
		}
	}

	var docwidth=document.all? truebody().scrollLeft+truebody().clientWidth : pageXOffset+window.innerWidth-offsetfrommouse[0]
	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"
}
}