js async for, very cool

This is something nice. This code can create for interrupts for those long functions in ie, so you can tell the user what is happening :). You can run it in the fireBug's console to see what I mean :).

function async_for_each(object,cbk,limit_callback,end_cbk,limit,timeout,start){
    var l=object.length;
 limit = limit || Math.round(l/100);
 start = start || 0;
 timeout = timeout || 1;
 for(var i=start;ilimit){
   setTimeout(function(){
    async_for_each(object,cbk,limit_callback,end_cbk,limit,timeout,i)
   },timeout);
   limit_callback(i,l);
   return false;
  }else{
   cbk(i,object[i]);
  }
 }
 end_cbk?end_cbk():null;
 return true;
}

var a = [];
a.length = 1000;

async_for_each(a,function(){},function(i,l){console.log("locading %s/%s - %s%",i,l,Math.round(i*100/l))});