function winOpen(which, width, height){
	var xMax = screen.width, yMax = screen.height;
	var xOffset = (xMax - 640)/2, yOffset = (yMax - 480)/2;
	
	window.open(which + '.html',which,'width=' + width + ',height=' + height + ',scrollbars=no,resizable=no,toolbar=no,location=no,status=no,left=' + xOffset + ',top=' + yOffset);
}