$(window).bind("load", function() {
    var activeOpacity   = 1.0,
        inactiveOpacity = 0.3,
        fadeTime = 250,
        clickedClass = "selected",
        thumbs = "#menu";

    $(thumbs).fadeTo(1, inactiveOpacity);

    $(thumbs).hover(
        function(){
            $(this).fadeTo(fadeTime, activeOpacity);
        },
        function(){
            // Only fade out if the user hasn't clicked the thumb
            if(!$(this).hasClass(clickedClass)) {
                $(this).fadeTo(fadeTime, inactiveOpacity);
            }
        });
     $(thumbs).click(function() {
         // Remove selected class from any elements other than this
         var previous = $(thumbs + '.' + clickedClass).eq();
         var clicked = $(this);
         if(clicked !== previous) {
             previous.removeClass(clickedClass);
         }
         clicked.addClass(clickedClass).fadeTo(fadeTime, activeOpacity);
     });
});