function loadwindow()
{
    var width=750;
    var height=505;
    var left= parseInt((screen.availWidth/2) - (width/2));
    var top = parseInt((screen.availHeight/2) - (height/2))-20;
    var sOption="toolbar=no,location=no,directories=no,menubar=no,navigationbar=no,";
    sOption+="scrollbars=no,width=500,height=80,left ="+left+",top="+top+"";
    window.open('SubscribeUser.aspx',"",sOption);
}