function popUp(URL) {
day = new Date();
id = day.getTime();
eval("page" + id + " = window.open(URL, '" + id + "', 'toolbar=0,scrollbars=0,location=0,statusbar=0,menubar=0,resizable=0,width=400,height=500,left = 520,top = 146');");
}

document.write('<a href="javascript:popUp(\'/xsitechat/chatter/message.php\')"><img src="/xsitechat/images/status/offline.jpg" alt="We are offline - leave a message" border="0" /></a>');