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var offsetfrommouse=[15,0]; //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 defaultimageheight = 300;	// maximum image size.
var defaultimagewidth = 350;	// maximum image size.

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";
	gettrailobj().top="-1000px";	
//	clearTimeout(timer);

}

function showtrail(imagename,title){

    defaultimageheight = 300;
    defaultimagewidth = 350;
    var imgObj=new Image();
    imgObj.src=imagename;
    
	  i = imagename;
	  t = title;
	  w = imgObj.width;
	  h = imgObj.height;

	  show(i,t,w,h);
}

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+=20;
		height+=20;
    defaultimageheight = height;	// maximum image size.
    defaultimagewidth = width;	// maximum image size.
        	
		newHTML = '<div class="border_preview" style="width:'+  width +'px;height:'+ height +'px">';
		newHTML+= '<div id="loader_container"><div id="loader">';
		newHTML+= '<div align="center">
ang load hình £nh...</div><div id="loader_bg"><div id="progress"> </div></div></div></div>';
		newHTML+= '<div class="preview_temp_load"><div class="preview_title"><b>' +title + '</b></div>';
    	newHTML+= '<img onload="javascript:remove_loading(this);" src="' + imagename + '" border="2"></div>';
		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>';
		}		

		document.onmousemove=followmouse;
		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";

}