function seachb() {
    JsHttpRequest.query(
      'bck/mkb_seach.php',
      {
        f: document.getElementById("seachm") 
      },
      function(result, errors) {
        document.getElementById("debug").innerHTML = errors; 
        if (result) {
            document.getElementById("rslt").style.display='block';
            document.getElementById("rslt").innerHTML = result["str"];
        }
      },
      true
    );
  }