function validate(){
 if (document.contact_form.Tel.value==''){
 alert('Please enter a telephone number');
 return false;
 } else {
  //added by webplacing 18-02-03
 window.open('stats.htm','stats','width=300, heigh=300, scrollbars=no, toolbar=no, status=no, resizable=no');
 return true;
 }
}