[jQuery] AJAX data in IE

[Charlie22]

hi crew,
as ususally I have strange problem..take a look to code:

$(function(){
        $('.tablesorter').tablesorter({widgets: ['zebra']});
        $('#subMenu a').click(function(){
        var trida = $(this).attr('href');
        console.log(trida);
        $('#content>*').remove();
                $.ajax({
                        url: 'pilots.php',
                        cache: false,
                        type: 'POST',
                        dataType: 'html',
                        data: 'trida='+trida,
                        success: function(html){
                                        $('#content').append(html)}
                        });
        return false;
        });
});

this code works great, but not in IE. Problem is causing by value
"data".
If I set: data: 'trida=15', than everything goes OK, but if I set
valeu from variable, IE return only a little part of requesting page.
So what is wrong in my AJAX code?