function emailPopup () { 
if (document.emailbox.email_addr.value) { 
 emailURL = 'http://lists.ipcmedia.com/cgi-bin/subscribe.cgi/19?email_addr=' + document.emailbox.email_addr.value; 
window.open(emailURL, "emailpopupwindow", 'height=400,width=500,status=no,toolbar=no,menubar=no,scrollbars=yes,resizable=yes,location=no');

} 
return false; 
}