function popup(URL, NAME, WIDTH, HEIGHT, SCROLL) {
	LEFT = (screen.availWidth - WIDTH) / 2;
	TOP = (screen.availHeight - HEIGHT) / 2;
	popupWindow = window.open(URL,NAME,'height='+HEIGHT+',width='+WIDTH+',resizable=yes,scrollbars='+SCROLL+',left='+LEFT+',top='+TOP+',menubar=no,toolbar=no,personalbar=no,statusbar=no,locationbar=no,screenX=0,screenY=0,left=0,top=0');
	popupWindow.focus();
}