var emailFilter=/^.+@.+\..{2,3}$/;
   var illegalChars= /[\(\)\<\>\,\;\:\\\/\"\[\]]/;
   function checkscript(form) {
      if(form.name.value.length < 3) {
         alert('Please enter your name');
         form.name.focus()
         return false;
      }
      if(!(emailFilter.test(form.email.value))) {
         alert('Please enter a valid email address');
         form.email.focus()
         return false;
      }
      if(form.email.value.match(illegalChars)) {
         alert('The email address contains illegal characters.');
         form.email.focus()
         return false;
      }
      if(form.phone.value.length < 3) {
         alert('Please enter your contact phone number');
         form.phone.focus()
         return false;
      }
      if(form.comments.value.length < 5) {
         alert('Please enter your comments/enquiry');
         form.comments.focus()
         return false;
      }
      return true;
   }