jQuery Grid Plugin - jqGrid

Hi,
I'm developing a page using several jqGrid's and I want to add generic functionality for all my grids.
I've added:
$(".ui-jqgrid-htable th div").dblclick(function(event) {

to catch the double click no the header but I want to catch the ID of the grid to use it for adding rows etc.
If i try this.id I get a longer Id than specified. For example I've added a grid called #grid1 I receive jqqh_grid1 using this.id.

Any ideas how to get the grid id, or should I add my generic function in some other way?
Thx,
A:)