function validate_contactform ( )
{
    valid = true;

    if ( document.contact_form.name.value == "" || document.contact_form.message.value == "" || document.contact_form.email.value == "" )
    {
        alert ( "Please make sure all details marked with * are complete." );
        valid = false;
    }   
    else if(document.contact_form.message.value.length>400)
    {
        alert ( "Your message must be less than 400 characters." );
        valid = false;
    }
    

    return valid;
}