$(document).ready(function(){
        $(".fadein_on").fadeTo("slow", 1.0); // This sets the opacity of the thumbs to fade down to 30% when the page loads
        $(".fadein_off").fadeTo("slow", 0.3); // This sets the opacity of the thumbs to fade down to 30% when the page loads
        $(".fadein_off").hover(function(){
                $(this).fadeTo("slow", 1.0); // This should set the opacity to 100% on hover
        },function(){
                $(this).fadeTo("slow", 0.3); // This should set the opacity back to 30% on mouseout
        });
});