How to get selected record id in an iframe using JavaScript in MS CRM 2011?

Hi Friends,

I am setting up the url of iframe in Contract entity using JS. My ifram url points to Associated View url. Now, I want to get the id of a record which has been selected in an iframe using JS.

Fyi, I have tried the below code.

var gridControl = document.getElementById("yourSubGridName").control;
var ids = gridControl.get_selectedIds();

I cannot see the method name as get_selectedIds() which will give you the id of a selected row.

Please suggest. Thanks!