function Validate()
{
var inputStr = document.getElementById('fName').value;
if (inputStr == "") {
alert ("Please enter your first name.");
document.getElementById('fName').focus();
return false ; }

var inputStr = document.getElementById('lName').value;
if (inputStr == "") {
alert ("Please enter your last name.");
document.getElementById('lName').focus();
return false ; }

var inputStr = document.getElementById('phoneCode').value;
if (inputStr == "") {
alert ("Please enter your phone number so that we may contact you.");
document.getElementById('phoneCode').focus();
return false ; }

var inputStr = document.getElementById('phoneMid').value;
if (inputStr == "") {
alert ("Please enter your phone number so that we may contact you.");
document.getElementById('phoneMid').focus();
return false ; }

var inputStr = document.getElementById('phoneEnd').value;
if (inputStr == "") {
alert ("Please enter your phone number so that we may contact you.");
document.getElementById('phoneEnd').focus();
return false ; }

var inputStr = document.getElementById('email').value;
if (inputStr == "") {
alert ("Please enter your email address.");
document.getElementById('email').focus();
return false ; }

if(document.getElementById('email').value.indexOf("@") < 1 || document.getElementById('email').value.lastIndexOf(".") < document.getElementById('email').value.indexOf("@") || document.getElementById('email').value.length < 6){
alert("Please enter a valid email address.");
document.getElementById('email').focus();
return false;}

var inputStr = document.getElementById('address').value;
if (inputStr == "") {
alert ("Please enter your address.");
document.getElementById('address').focus();
return false ; }

var inputStr = document.getElementById('city').value;
if (inputStr == "") {
alert ("Please enter the city in which you reside.");
document.getElementById('city').focus();
return false ; }

var inputStr = document.getElementById('state').value;
if (inputStr == "") {
alert ("Please select your state.");
document.getElementById('state').focus();
return false ; }

var inputStr = document.getElementById('zip').value;
if (inputStr == "") {
alert ("Please enter your zip code.");
document.getElementById('zip').focus();
return false ; }

var inputStr1 = document.getElementById('contact1').checked;
var inputStr2 = document.getElementById('contact2').checked;
var inputStr3 = document.getElementById('contact3').checked;
var inputStr4 = document.getElementById('contact4').checked;

if (
inputStr1 == false &&
inputStr2 == false &&
inputStr3 == false &&
inputStr4 == false)
{
alert ("Please specify the reason for contacting us today.");
document.getElementById('contact1').focus();
return false;}

var inputStr = document.getElementById('comments').value;
if (inputStr == "") {
alert ("Please tell us more about the reason for contacting us today.");
document.getElementById('comments').focus();
return false;}

}

<!-- Begin
var isNN = (navigator.appName.indexOf("Netscape")!=-1);
function autoTab(input,len, e) {
var keyCode = (isNN) ? e.which : e.keyCode;
var filter = (isNN) ? [0,8,9] : [0,8,9,16,17,18,37,38,39,40,46];
if(input.value.length >= len && !containsElement(filter,keyCode)) {
input.value = input.value.slice(0, len);
input.form[(getIndex(input)+1) % input.form.length].focus();
}
function containsElement(arr, ele) {
var found = false, index = 0;
while(!found && index < arr.length)
if(arr[index] == ele)
found = true;
else
index++;
return found;
}
function getIndex(input) {
var index = -1, i = 0, found = false;
while (i < input.form.length && index == -1)
if (input.form[i] == input)index = i;
else i++;
return index;
}
return true;
}
// End -->