function validate() {

if (document.getElementById("contactus").first_name.value=="") {
window.alert("First Name can not be blank"); return false; }
if (document.getElementById("contactus").last_name.value=="") {
window.alert("Last Name can not be blank"); return false; }
if (document.getElementById("contactus").company.value=="") {
window.alert("Company can not be blank"); return false; }
if (document.getElementById("contactus").address.value=="") {
window.alert("Address can not be blank"); return false; }
if (document.getElementById("contactus").city.value=="") {
window.alert("City can not be blank"); return false; }
if (document.getElementById("contactus").country.value=="") {
window.alert("Country can not be blank"); return false; }
if (document.getElementById("contactus").val_numbers.value=="") {
window.alert("Please fill in the validation numbers"); return false; }
}