Prototype conversion stuck

Hey guys im not very good with both jquery or Prototype so i started to convert the parts I know, so could 开发者_如何学运维you please do the rest and thanks guys

$(document).ready(function(){

    var offsetLeft=$('menu').offsetLeft;
    Event.observe('menu', 'mousemove', function(event){

        coordinateX=Event.pointerX(event)-offsetLeft;
        $('slider').style.marginLeft=coordinateX-20+'px';

    });

});

question: can you help me with the conversion to jquery

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Direct translation would be:

$(document).ready(function(){
    var offsetLeft = $('#menu').offset().left;
    $('#menu').bind('mousemove', function(event) {
        var coordinateX = event.pageX - offsetLeft;
        $('#slider').css("margin-left", (coordinateX - 20) + 'px');
    });
});

Live test case.

However, you better read the documentation and understand how things work so that you can do those things on your own in the future.