function validate_request() {
if (!document.contactForm.first_name.value) {   alert ('The Name field is mandatory');   document.contactForm.first_name.focus();   return;}if (!document.contactForm.last_name.value) {   alert ('The Surname field is mandatory');   document.contactForm.last_name.focus();   return;}if (!document.contactForm.email.value) {   alert ('The E-mail fiels is mandatory');   document.contactForm.email.focus();   return;}if (!document.contactForm.message.value) {   alert ('The Message field is mandatory');   document.contactForm.message.focus();   return;}document.contactForm.submit();

}