/**
  Set the service ID and page alias for form's post action
  @param Form frm the form object
  @param string sid Service ID
  @param string alias Page's alias or Widget ID
*/
function setFormAction(frm, sid, alias){
    //Set post service ID
    if (frm.POST_SERVICE != undefined)
        frm.POST_SERVICE.value = sid;
    else
        $(frm).append('<input type="hidden" value="'+sid+'" name="POST_SERVICE">');
    
    //Set post success page alias
    if (alias != ''){
        if (frm.POST_SUCCESS_PAGE != undefined)
            frm.POST_SUCCESS_PAGE.value = alias;
        else
            $(frm).append('<input type="hidden" value="'+alias+'" name="POST_SUCCESS_PAGE">');
    }
}