Jquery/javascript problem in chrome

im trying to do some processing on close event of jquery multiselect plugin by erichynds

the problem is chrome seems to get lost in the following loop,

   for(var a in f)
   {    
    var h = f[a开发者_StackOverflow社区];
    $('#modelselect0 optgroup[label='+h+']').each(function(e){         
     var opt = $(this).find('option').filter(':selected');  
     if(opt.length !=0)
     {      
     opt.each(function(){     
      var tempIndex = tt.indexOf(h);       
      if(ff.length!=0)
      {
       ff += ","+$(this).text();
      }
      else
      {
       ff=$(this).text();
      }      
      });     
     }
     else
     {     
      if(ff.length!=0)
      {
       ff += ","+h;
      }
      else
      {
       ff=h;
      }     
     }     
   });    
   }

works fine in FF, opera.

any help is appreciated.

---

try changing:

for(var a in f)

to:

var a;
for(a in f)