function onLoad(){
    var obj = document.email_form;
    obj.onsubmit = emailTo;
}

function emailTo(){    
    var obj = document.email_form;
    var email;
    switch (obj.department.value){
        case "General Sales":
            email = "sales@jimdiinc.com"
            break;
        case "Sure Step Hog Flooring Sales":
            email = "surestepsales@jimdiinc.com"
            break;
        case "Billing":
            email = "billing@jimdiinc.com"
            break;
        case "Marketing":
            email = "marketing@jimdiinc.com"
            break;
        default:
            email = "sales@jimdiinc.com";
    }
    obj._mailto.value = email;
    return Validate("email_form");
}