jQuery(function($) {
  $("#adField").html(ptAD(ad_json, 5));
});
function randSort(){
  return Math.random() > 0.5 ? -1 : 1;
}
function ptAD(jsonV, numb) {
  if(jsonV == '' || numb <= 0) {
      return '';
  }
  var rkey = new Array();
  var rtstr = '';
  var obj = eval(jsonV);
  var newlink = new Array();

  if(obj.length <= numb) numb = obj.length;
  
  for(var i = 0; i < obj.length; i++) {
    rkey[i] = i;
  }

  rkey.sort(randSort);
  for(var i = 0; i < numb; i++) {
    rtstr += "<td align=\"center\"><a href=\""+obj[rkey[i]].link+"\" target=\"_blank\">"+obj[rkey[i]].text+"</a></td>";
  }
  return rtstr;
}