function openWindow(url, height, width, resize)
{
	var h=height;
	var w=width;
	
	if (h==null) h=300;
	if (w==null) w=500;
	
	if (resize!=null){
		var r = (resize==true) ? "yes" : "no"}
	else{
		r = "yes";
	}
	var l = Math.ceil( (window.screen.width  - w) / 2 );
	var t = Math.ceil( (window.screen.height - h) / 2 );
	
	var val= window.open(url, "_blank", "top="+t+", left="+l+", width="+w+", height="+h+", status=no, toolbar=no, menubar=no, location=no, resizable=" + r +", border=0, scrollbars=yes");

}