i have myData map as below

 var myData =  new Object();



 myData[10427] = Description 10427;

 myData[10504] = Description 10504;

 myData[10419] = Description 10419;

but now when i iterate over myData, i don't get same sequnce in chrome and IE works fine in firefox. It iterates in ascending order of key

for (var key in myData) {

  alert(key is+key);

  }

i get the output in ascending order in alert as 10419,10427,10504

How i can make sure to iterate in same order as data as inserted in map?