Cannot catch mouseup event

[lyricus]

Hello, I need to catch mouseup event to update data just after user's final choice.

My code (doesn't alert when mouse key released):

        <script type="text/javascript" charset="utf-8">
        jQuery(document).ready(function () {
            jQuery("#Slider1").slider({
                from: 5,
                to: 500,
                step: 5,
                smooth: true,
                round: 0,
                dimension: "&nbsp;Gb",
                skin: "plastic"
            });

            jQuery("#Slider1").mouseup(function(){
                alert('The mouse key has been released');
            });
        });
        </script>

Could you please help me, what's wrong with it?

[lyricus]

Sorry, catched by onstatechange

<script type="text/javascript" charset="utf-8"> jQuery(document).ready(function () { jQuery("#Slider1").slider({ from: 5, to: 500, step: 5, smooth: true, round: 0, dimension: " Gb", skin: "plastic", onstatechange: function( value ){ alert(value); } }); }); </script>