This is the code I'm using to grap the values from the selectbox:
var catIDs  = new Array();
     jQuery("#cat_filter").each(function() {
      catIDs.push(jQuery(this).val());
     });
I'm then trying to pass these through an ajax GET command but get the above error.
I have tried to put the values into a comma seperated string but don't know how to interpret that at the other end.   I tried change the variables config to Integers but that doesn't work either, works for 1 selected value but not multiple.
I was also looking at the match options and don't see an "in" match although there is a "not in" match whcih seems like an obmission?