function randomizeSpotlight(theclass){
    var imageprefix = "img_";
    var image_class_suffix = "_images";
    var elements = $('div.'+theclass).hide();
    $('div.'+theclass+image_class_suffix).hide();
    var i=0;
    var r = Math.floor(Math.random()*elements.length+1)-1;
    var id = $($('div.'+theclass).get(r)).css('display','block').attr('id');
    $('div#'+imageprefix+id).css('display','block');
}