function openPopup(url,h,w) {
	//open modal dialog window with the content in the URL passed to function
	//window.showModalDialog(url,null,"dialogWidth=550px;dialogHeight=400px;center:yes;help:no;status:no");
	
	if (h == '') {
		h = '400px';
	}
	if (w == '') {
		w = '550px';
	}
	
	window.showModalDialog(url,null,"dialogWidth=" + w + ";dialogHeight=" + h + ";center:yes;help:no;status:no");
}