How to show hidden row details only in a specific column ?

Good Morning !
I'm trying to follow the example to show details of hidden row. And it works, but I have 3 columns with images and when I click on any of the images, the "fnIsOpen" is called.
I just need to execute the function in a column.
How do I do that function execute only in a specific column?

$('#tabtravel tbody td img').live('click', function () {
		
        var nTr = $(this).parents('tr')[0];
		 
        if ( oTable.fnIsOpen(nTr) )
        {
            /* This row is already open - close it */
            this.src = "img/details_open.png";
            oTable.fnClose( nTr );
        }
        else
        {
            /* Open this row */
            this.src = "img/details_close.png";
            oTable.fnOpen( nTr, fnFormatDetails(oTable, nTr), 'details' );
		}
		
    } );
	otable = $('#tabtravel').dataTable();
} );		

Thank you for your attention,

Allan Teixeira