Auto field update for Infopath in SharePoint (part 2)

This time I have used some Jquery to decrease the lines of code,

<script src="http://code.jquery.com/jquery-latest.js">
</script>
<script type="text/javascript">

_spBodyOnLoadFunctionNames.push("FillOrWait");

var maxTime = 1000;
var waitPeriod = 500;
var totalWait = 0; 

function FillOrWait()
{

   if( $('input[title=OccupationField]').length==0 && totalWait<maxTime)
   {
      totalWait = totalWait + waitPeriod;       
      window.setTimeout(FillOrWait,waitPeriod);
   }
   else
   {
       var valueField = getQuerystring("Occupation");
       $('input[title=OccupationField]').val(valueField);
   }
}

function getQuerystring(key, default_)
{
 if (default_==null) default_="";
 key = key.replace(/[\[]/,"\\\[").replace(/[\]]/,"\\\]");
 var regex = new RegExp("[\\?&]"+key+"=([^&#]*)");
 var qs = regex.exec(window.location.href);
 if(qs == null)
  return default_;
 else
  return qs[1];
}
 </script>