function GetBalance_onclick() {
var url;
day = new Date();
id = day.getTime();
url = "https://www.valutec.net/Customers/Balance.aspx?CardNo=" + document.getElementById("Cardno").value;
eval("page" + id + " = window.open(url, '" + id + "', 'toolbar=0,scrollbars=0,location=0,statusbar=0,menubar=0,resizable=0,width=804,height=680,left = 50,top = 50');");
}