function popUp(URL) {
		day = new Date();
		id = day.getTime();
		eval("page" + id + " = window.open(URL, '" + id + "', 'toolbar=0,scrollbars=1,location=0,statusbar=0,menubar=0,resizable=0,width=660,height=470,left = 167,top = 144');");
		}

function valid(f) {
			if (!/^\d*$/.test(f.value)) {
				alert("Only integer numbers allowed!");
				f.value = f.value.replace(/[^\d]/g,"");
			}
		}