function validate(form){    
    if (form.first_name.value == "") {    
      alert('Please enter your first name.');     
      form.first_name.focus();    
      return false;    
    }    
    if (form.last_name.value == "") {    
      alert('Please enter your last Name.');     
      form.last_name.focus();    
      return false;    
      }    
    if (form.telephone.value == "") {    
      alert('Please enter your telephone number.');     
      form.telephone.focus();    
      return false;    
      }    
    if (form.specific_date1.value == "") {    
      alert('Please enter the date of your event.');     
      form.specific_date1.focus();    
      return false;    
      }    
    if (form.guests.value == "") {    
      alert('Please enter the number of guests.');     
      form.no_guests.focus();    
      return false;    
      }    
 }