var blankImage= new Image();
blankImage.src="blank.gif"
var newImage, img, target="main", strPar, parent, posy, parentsTop=2

function showImage(r, source, yref) {
   	strPar="";
	for (var i=0; i<parentsTop; i++) strPar+=".parentNode"
	parent= eval("r"+strPar)
	divWindow = document.getElementById(target);
	if (!yref) yref=0
	posy=parent.offsetTop+yref+"px"
	divWindow.style.top=posy
	
	img = divWindow.getElementsByTagName('IMG')[0];
	img.src = blankImage.src
	newImage = new Image();
	newImage.src = source;
	divWindow.style.visibility = 'visible'
	loadImage()

}
function loadImage() {
	if (!newImage.complete) setTimeout('loadImage()', 100)
	else img.src=newImage.src
}

function hideDiv() {
	var div=document.getElementById('main')
    div.style.visibility='hidden'
}