var offsetfrommouse=[15,25]; //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 = 40;	// maximum image size.
var defaultimagewidth = 40;	// 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=getPos(document.getElementById('colRight')).x;
	clearTimeout(timer);
}

function showtrail(imagename,title,width,height){
	i = imagename
	t = title
	w = width
	h = height
	show(imagename,t,w,h);
	// timer = setTimeout("show('"+i+"',t,w,h)",200);

	// if ( document.getElementById(title) ){ alert(document.getElementById(title).offsetLeft); }else{ alert('no'); }

}
function show(imagename,title,width,height){
// alert(imagename);
    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+=0
		height+=0
		defaultimageheight = height
		defaultimagewidth = width
	
		//document.onmousemove=followmouse; 

		newHTML = '<div style="background-color: transparent"  class="border_preview" style="width:'+  width +'px;height:'+ height +'px;"><div id="loader_container"><div style="background-color: blue"  id="loader">prévisualisation de l\'image</div> <div id="loader_bg"><div id="progress"> </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  allowtransparency="true" style="background-color: transparent"   src="about:blank" scrolling="no" frameborder="0" width="'+width+'" height="'+height+'"><table cellpadding="0" cellspacing="0" ><tr><td></td></tr></iframe>';
		}		

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

		// ~~~~~~~~~~~~
		// width = width + 50;
		
		topLine = getPos(document.getElementById(title)).y;
		newLeft = (getPos(document.getElementById("colRight")).x + getSize(document.getElementById("colRight")).w - width - 1 );
		newTop  = (getPos(document.getElementById(title)).y + getSize(document.getElementById(title)).h - height - 1);
		newTop = (topLine - f_scrollTop()) + height <= f_clientHeight() ? topLine -1 : newTop;
		
		gettrailobj().left=getPos(document.getElementById('colRight')).x  + "px";
		gettrailobj().top=newTop + "px";
		// alert( f_scrollTop());
		// gettrailobj().top=getPos(document.getElementById(title)).y + "px";

	}

	// alert('previewid (x='+getPos(document.getElementById('preview_div')).x+',y='+getPos(document.getElementById('preview_div')).y+'\n'+
		  // 'colRight (x='+getPos(document.getElementById('colRight')).x+',y='+getPos(document.getElementById('colRight')).y+')\n'+
		  // 'finalx'+gettrailobj().left+')\n'
		// );
	
}

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"

}

function getPos (obj) {
	var pos = {x: obj.offsetLeft||0, y: obj.offsetTop||0};
		while(obj = obj.offsetParent) {
			pos.x += obj.offsetLeft||0;
			pos.y += obj.offsetTop||0;
		}
	return pos;
}

function getSize(obj){
	return {w: obj.offsetWidth||0, h: obj.offsetHeight||0}
}

function f_clientWidth() {
	return f_filterResults (
		window.innerWidth ? window.innerWidth : 0,
		document.documentElement ? document.documentElement.clientWidth : 0,
		document.body ? document.body.clientWidth : 0
	);
}
function f_clientHeight() {
	return f_filterResults (
		window.innerHeight ? window.innerHeight : 0,
		document.documentElement ? document.documentElement.clientHeight : 0,
		document.body ? document.body.clientHeight : 0
	);
}
function f_scrollLeft() {
	return f_filterResults (
		window.pageXOffset ? window.pageXOffset : 0,
		document.documentElement ? document.documentElement.scrollLeft : 0,
		document.body ? document.body.scrollLeft : 0
	);
}
function f_scrollTop() {
	return f_filterResults (
		window.pageYOffset ? window.pageYOffset : 0,
		document.documentElement ? document.documentElement.scrollTop : 0,
		document.body ? document.body.scrollTop : 0
	);
}
function f_filterResults(n_win, n_docel, n_body) {
	var n_result = n_win ? n_win : 0;
	if (n_docel && (!n_result || (n_result > n_docel)))
		n_result = n_docel;
	return n_body && (!n_result || (n_result > n_body)) ? n_body : n_result;
}

///////

var t_id = setInterval(animate,20);
var pos=0;
var dir=2;
var len=0;

function animate()
{
var elem = document.getElementById('progress');
if(elem != null) {
if (pos==0) len += dir;
if (len>32 || pos>79) pos += dir;
if (pos>79) len -= dir;
if (pos>79 && len==0) pos=0;
elem.style.left = pos;
elem.style.width = len;
}
}

function remove_loading() {
this.clearInterval(t_id);
var targelem = document.getElementById('loader_container');
targelem.style.display='none';
targelem.style.visibility='hidden';
var t_id = setInterval(animate,60);
}