function contactvalidate() {
 if (document.contactform.fullname.value.length < 1) {
    alert("Please enter your full name");
    document.contactform.fullname.focus();
    return false;
 }
 if (document.contactform.emailaddress.value.length < 1) {
    alert("Please enter your email address");
    document.contactform.emailaddress.focus();
    return false;
 }
 return true;
}