$(".jqgrow td:not(:first-child)")
    .mouseenter(function(){
    $.doTimeout('cellhover', 1000, function(e){
        my_tooltip
        .css({opacity:0.85, display:"none"})
        .stop() // Added stop() to fix bug, flickering of tooltip
        .fadeIn(10);
    });
});

$(".jqgrow td:not(:first-child) td:empty")
$(".jqgrow td:empty td:not(:first-child)")
$(".jqgrow td:not(:first-child, :empty)")

// Select td elements in .jqgrow that are neither :first-child nor :empty
$(".jqgrow td:not(:first-child, :empty)")