$(document).ready(function() {
    $('#home ul li').bind('mouseover',function(){
        id = $('#toggle'+$(this).attr('class')) ;
        if(id.is(':hidden')){
            $('#home div.bloc').slideUp(100);
            id.slideDown(250);
        }
    });
    $('#home .bloc').hide();
    $('#home ul li:first').trigger('mouseover');
});