var offsetfrommouse=[15,15]; //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 defaultimageheight = 240;	// maximum image size.
var defaultimagewidth = 320;	// maximum image size.

var timer;

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

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


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


function hidetrail(){	
  gettrailobj().display= "none";
  document.onmousemove="";
	 gettrailobj().left="-320px";
	 //clearTimeout(timer);
}

function showtrail(imagename,title,width,height) {
	i = imagename;
	t = title;
	w = width;
	h = height;
	show(i,t,w,h);
	//timer = setTimeout("show('" + i + "',t,w,h);",0);
}

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+=55

		defaultimageheight = height;
		defaultimagewidth = width;
	
		document.onmousemove=followmouse; 

		
		//newHTML = '<div class="image_preview" style="width:'+  width + 'px; height:'+ height + 'px;">';
  newHTML = '<img class="image_hover_load" onload="" height="' + height +'" width="' + width + '" src="' + imagename + '" />';
		//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; // Move to the left side of the cursor
		} 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; // Move to the left side of the cursor
		} 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"

}