 <!--
 function validate_form() {
if(document.guest_book.full_name.value == ""){
alert("Please enter your name");
document.guest_book.full_name.focus();
return false;
}
if(document.guest_book.email.value == ""){
alert("Please enter your email address");
document.guest_book.email.focus();
return false;
}
return true;

 }
 //-->