//gestion rollover
function SwitchToRollover($obj) {
    var reg = new RegExp("(.*)\.(.{3})", "g");
    if ($obj.attr('src').match(reg)) {
        var src = $obj.attr('src').replace(reg, "$1_roll.$2");
        $obj.attr('src', src);
    }
}
function SwitchToNormal($obj) {
    var reg = new RegExp("(.*)(_roll)\.(.{3})", "g");
    if ($obj.attr('src').match(reg)) {
        var src = $obj.attr('src').replace(reg, "$1.$3");
        $obj.attr('src', src);
    }
}

$(function() {
    $('.rollover').unbind('mouseenter');
    $('.rollover').unbind('mouseleave');

    $('.rollover').mouseenter(function(event) {
        if (!$(this).hasClass('selected'))
            SwitchToRollover($(this));
    });

    $('.rollover').mouseleave(function(event) {
        if (!$(this).hasClass('selected'))
            SwitchToNormal($(this));
    });    
});