Is there a post render / on show event ?

Hi, I'm using datatables with sAjaxSource and I was wondering how can I call some js code on client side after the table is being shown ?
I want to add some html to one of the column headers... And I can't seems to find the right way to add it after the table is already being shwon

So , how can I set some js function to be called after the table is already done loading / shown

Thanks ahead,

Daniel.