var pghWin;
function showpgh(url, w, h) {
	if (!pghWin || pghWin.closed) { 
		pghWin = window.open(url, "blank", "width="+w+",height="+h+",toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=yes,resizable=0,top="+Math.floor((screen.height-h)/2)+",left="+Math.floor((screen.width-w)/2));
	} else {
		pghWin.location = url;
		pghWin.focus();
	} 
}