function checkForm() {
    email = document.getElementById('addressDSCOM');
    msg = document.getElementById('msgDSCOM');
    if (email.value == '') {
       alert("Please enter your email address!");
       email.focus();
       return false;
    }
    if (email.value.indexOf("@") == -1) {
       alert("Please enter a valid email address!");
       email.focus();
       return false;
    }
    if (msg.value == '') {
       alert("Please enter a message!");
       msg.focus();
       return false;
    }    
}