var win_bars = 'directories=no, location=no, menubar=no, status=no, titlebar=no, toolbar=no, scrollbars=yes';
var win_attr = win_bars+", height=600, width=800, resizable=yes, left=0, top=0";
var server_name = "http://24.17.171.238";

function userLogin()
{
   var url = new String( server_name+"/k12ambit/jsp/PortalMain.jsp");
   var newWin = window.open(url, "user_win", win_attr);
   newWin.focus();
}