Shift select table rows

I know this question has been asked a lot but there is really no definite answer that I can find. Here is my code. Basically I have everything set up. I'm just lost on where to get the rows of a table by index. I've tried the .index function but I that's not working. I'm trying to do something like $('#pkgLineTable').index(i).addClass('row_selected');

But that's not working correctly. Any help would be great. Thank you very much.

var lastSelected;

$('#pkgLineTable tr').live('click', function(event) {         

    var tableRow = $(this).closest("tr").prevAll("tr").length + 1;      
    if ($(this).hasClass('row_selected')) {
        $(this).removeClass('row_selected');       
    }
    else {           
        $(this).addClass('row_selected');         
    } 

    if (event.shiftKey) { 
        var table = $('#pkgLineTable');        


        var start = Math.min(tableRow, lastSelected);
        var end = Math.max(tableRow, lastSelected);                 

        for (var i = start; i < end; i++) {
            //$(this).parent().parent().addClass('row_s开发者_开发知识库elected'); 
        }

    } else {        

        lastSelected = $(this).closest("tr").prevAll("tr").length + 1;
    }

My start and end values are correct. If you select the 2 row and the 5 row you get back 2 and 5. It then iterates 2 - 5. I need to add a class to the rows 2 - 5.

Edit I used this:

    for (var i = start; i < end; i++) {
            $('#pkgLineTable').each(function() {
                $(this).find("tr").eq(i).addClass('row_selected');    
            });
        }

That's probably not the best way to do it.

---

instead of

for (var i = start; i < end; i++) {
  //$(this).parent().parent().addClass('row_selected'); 
}

use

table.find('tr:gt('+(start-1)+'):lt('+(end)+')').addClass('row_selected');