function openPopup(url,w,h,center,scroll) {
	if(w==null) { var w=620; }
	if(h==null) { var h=500; }
	if(center==null) { var center=false; }
	if(scroll==null) { var scroll='no'; }
	var day = new Date();
	var winame = day.getTime();
	
	if(center) {
		var t = (screen.height - h) / 2;
		var l = (screen.width - w) / 2;
	} else {
		var t = 0;
		var l = 0;
	}
	
	window.open(url,winame,"top="+t+"px,left="+l+"px,scrollbars="+scroll+",resizable=1,width="+w+"px,height="+h+"px");
}