function DoValidate()
{
    if (document.getElementById('txtName').value == "")
    {
        alert("Please enter your school name.");
        document.getElementById('txtName').style.backgroundColor= "Orange";
        document.getElementById('txtName').focus();
        return false;
    }
    
    if (document.getElementById('txtPhone').value == "")
    {
        alert("Please enter your contact telephone.");
        document.getElementById('txtPhone').style.backgroundColor= "Orange";
        document.getElementById('txtPhone').focus();
        return false;
    }
    
     if (document.getElementById('ddLocation').selectedIndex == 0)
    {
        alert("Please select your local office.");
        document.getElementById('ddLocation').style.backgroundColor= "Orange";
        document.getElementById('ddLocation').focus();
        return false;
    }
    
    if (document.getElementById('txtDetails').value == "")
    {
        alert("Please enter the purpose of your enquiry.");
        document.getElementById('txtDetails').style.backgroundColor= "Orange";
        document.getElementById('txtDetails').focus();
        return false;
    }
    
   return true;
}