function popUp(URL) {
	day = new Date();
	id = day.getTime();

	if(navigator.appName == "Microsoft Internet Explorer") {
		screenY = document.body.offsetHeight;
		screenX = window.screen.availWidth;
		}
	else {
		screenY = window.outerHeight
		screenX = window.outerWidth
		}

	windowWidth = 780
	windowHeight = 580
	fromLeft = (screenX - windowWidth)/2
	fromTop = (screenY - windowHeight)/2	
	
	eval("page" + id + " = window.open(URL, '" + id + "','toolbar=0,scrollbars=0,location=0,statusbar=0,menubar=0,resizable=0,width=" + windowWidth + ",height=" + windowHeight + ",left="+ fromLeft + ",top="+ fromTop + "');");

	//Palautetaan aina false, jolloin jos tukee javascriptiä, ei linkkiä seurata.
	return(false);
}