function popwin(url) {
 var url;
 var mywindow = window.open(url,'Metal_Express','width=400,height=400');
}

function launch_chat() {
 var mywindow = window.open('chat/index.htm','Metal_Express','width=500,height=140');
}

function submitform() {
 if  (document.sub_form.email_addr.value=='')
  alert("This email address is not valid");
 else {
  if ( ((document.sub_form.email_addr.value.indexOf('@',1))==-1) ||(document.sub_form.email_addr.value.indexOf('.',1))==-1 )
   alert("This email address is not valid");
  else
   document.sub_form.submit();
 }
}