[jQuery] Selecting an element using parent than filter

[Jasper Kennis]

Hey,

I'm trying to select an element to change the background-color
property of it, but I fail to select it. The script runs at
http://stud.cmd.hro.nl/0794249/portfoliovx/ . In the left column,
there are horizontal rules with five blue blocks to the right. When
hovering over the second from the left, i want the background of the
first block to change to orange as well. So far, I've written this:

<script>
function rateBlokjes () {
        $("#primary div.meta ul li.extra div.rateblok")
        .filter(".1")
        .hover(
                function(){
                        $(this).css({
                                "background-color" : "#DF3913"
                        });
                },
                function(){
                        $(this).css({
                                "background-color" : "#2E7FC3"
                        });
                })
        .end()

        .filter(".2")
        .hover(
                function(){
                        $(this).css({
                                "background-color" : "#DF3913"
                        });
                        $(this).parent().filter(".1").css({
                                "background-color" : "#DF3913"
                        });
                },
                function(){
                        $(this).css({
                                "background-color" : "#2E7FC3"
                        });
                })
        .end();
}
</script>

And the html of the bars looks like this

<div class="meta">
                <ul>
                <li>17 mei 2008</li>
            <li>Nog geen cijfer</li>
            <li>Boekbinder</li>
            <li class="extra">
              <div class="rateblok 5"></div>
              <div class="rateblok 4"></div>
              <div class="rateblok 3"></div>
              <div class="rateblok 2"></div>
              <div class="rateblok 1"></div>
            </li>
          </ul>
        </div>

I know the script isn't optimal, I'm planning on fine tuning it later,
but for now, could someone tell my why selecting with $
(this).parent().filter(".1") doesn't work?

Tnx and greetings,

Jasper Kennis