function centerpopup(URL,width,height) {
	x = screen.width;
	y = screen.height;

	popup = window.open(URL, 
		'botten', 
		'top=' + parseInt(y/2-height/2-29) + 
		', left=' + parseInt(x/2-width/2-4) + 
		', width=' + width + 
		', height=' + height, 
		scrollbars=1);
		popup.focus();
}