function getFormValue(form_name) {
    /* Use MochiKit.DOM to search the document for a form element matching form_name, and return the value */
    kv = MochiKit.DOM.formContents();
    names = kv[0];
    values = kv[1];

    len = Math.min(names.length, values.length);
    for(i=0; i<len; i++) {
        if(names[i] == form_name) {
            return values[i];
        }
    }
    return null;
};