function newAjax() {
  var ajax;
  if ( window.XMLHttpRequest ) {
    ajax = new XMLHttpRequest ();
    if ( ajax.overrideMimeType ) {
      ajax.overrideMimeType ( 'text/xml' );
    }
  } 
  else 
    if ( window.ActiveXObject ) {
      try {
        ajax = new ActiveXObject ( "Msxml2.XMLHTTP" );
      } 
	  catch (e) {
        try {
          ajax = new ActiveXObject ( "Microsoft.XMLHTTP" );
        } 
	    catch (e) {}
      }
  }
  return ajax;	
}

var ajax = newAjax();
var ajax_now = 0;
var interhtml;
var currentgrid;