act = '.back-main';
ch = true;
b = true;
ti = null;

function returnDef() {
    if ( (act != '.back-main') & (b) ) {
        act = '.back-main';
        ch = false;
        $('.float_back').animate({opacity:0});
        $(act).animate({opacity:1}, 500, '', function () {
            ch = true;
        });
    }
}

$(document).ready( function() {
    $('.float_back').height( $('#layout').height() );
    $(act).animate({opacity:1});
    $('.bmenu a').mousemove(function() {
        b=false;
        back = '.' + $(this).attr('rel');
        if ( (act != back) & (ch) ) {
            act = back;
            ch = false;
            $('.float_back').animate({opacity:0});
            $(back).animate({opacity:1}, 100, '', function () {
                ch = true;
            });
        }
    });
    $('.bmenu').mouseout(function() {
        b = true;
        ti = setTimeout("returnDef()",3000);
    });
});