function popupnewwindow(url_addr, scroll, w, h)
{
	if(typeof(scroll) == 'undefined') { scroll = 'yes'; }
	if(typeof(w) == 'undefined') { w = 600; }
	if(typeof(h) == 'undefined') { h = 500; }
	var paramstring = "toolbar=no,location=no,directories=no,status=no,menubar=no,resizable=yes," + "scrollbars=" + scroll + ",width=" + w + ",height=" + h;
	window.open(url_addr,"_blank",paramstring);
}