function openWindow(data,height,width) {
	WidthCentre = 0;
	HeightCentre = 0;

	var halfHeight = height/2;
	var halfWidth = width/2;

	if (screen) {
		WidthCentre = (screen.width/2)-halfWidth;
		HeightCentre =(screen.height/2)-halfHeight;
	}
	config='scrollbars=yes,resizable=yes,toolbar=no,location=no,directories=no,status=no,menubar=no,width='+width+',height='+height+',left='+WidthCentre+',top='+HeightCentre+''
	window.open (data,"_blank",config);
}