Endless Loop If Two Item To Sort Are Equal

I figured out the one question but I am thinking the code below would get into an endless loop if two items to sort were equal because it never returns a 0 to alert the javascript sort function that the two items are equal... Is this correct?

The code ...
$(document).ready(function() {
$('#ascending').click(function() {
SORTER.sort('.sortable');
});
$('#descending').click(function() {
SORTER.sort('.sortable', 'desc');
});
});

var SORTER = {};
SORTER.sort = function(which, dir) {
SORTER.dir = (dir == "desc") ? -1 : 1;
$(which).each(function() {
// Find the list items and sort them
var sorted = $(this).find("> li").sort(function(a, b) {
return $(a).text().toLowerCase() > $(b).text().toLowerCase() ? SORTER.dir : -SORTER.dir;
});
$(this).append(sorted);
});
};