function modifie_source_valid (form,frame,formvar) {
        ret = '';
        iframe = document.getElementById(frame);
        if (typeof(iframe.document) == 'undefined') {
                elements = iframe.contentDocument.forms[0].elements;
        } else {
                elements = document.frames[frame].formrubs.elements;
        }
        for (i = 0; i < elements.length; i++) {
                if (elements[i].checked) {
                        if (ret.length > 0) {
                                ret = ret + ';';
                        }
                        ret = ret + elements[i].name + '=' + elements[i].value;
                }
        }

        document.forms[form].elements[formvar].value = ret;
}