var constThumb = "_th";
var objWindow;
var strTitle;
var strSrc;
function showImage(str) {
	var objImg = event.srcElement;
	if (objImg.src.indexOf(constThumb) == -1) {
		strSrc = unThumb(showImage.arguments[1]);
	} else {
		strSrc = unThumb(objImg.src);
	}
	strTitle = str;
	objWindow = window.open("image.html","_blank","scrollbars=no,toolbar=no,status=yes,width=500,height=530");
	window.setTimeout("loadWindow()",100);
}
function unThumb(str) {
	// remove thumbnail postfix from image file name
	return str.split(constThumb).join("");
}
function loadWindow() {
	objWindow.document.title = strTitle;
	objImg = objWindow.document.createElement("IMG");
	objImg.src = strSrc;
	objImg.width = "500";
	objImg.height = "530";
	objImg.onclick = function() { objWindow.close(); }
	objWindow.document.body.appendChild(objImg);
	objWindow.status = "click image to close window";
}