var slider;
     var currentMenu;
     var nextMenu;

     var slideshow_duration = 7000;
     var next_slide = {}
     var sfade;
     var mfade;



        function slideshow(fx,screen_id,type_filter) {
          fx.start(1,0)
          swapNextSlide.pass([screen_id,type_filter]).delay(800)
          fx.start.pass([0,1], fx).delay(1000);
        }

        function swapNextSlide(screen_id, type_filter){
           var sponsor = getNextSponsor(screen_id, type_filter)
           var screen = $(screen_id)
           removeChildren(screen)
           var h4 = document.createElement(h4)
           h4.appendChild( document.createTextNode(getSponsorName(sponsor)))
           var img = document.createElement('img')
           img.setAttribute('src','/us2007'+sponsor.img)
           img.setAttribute('alt',sponsor.name)
           screen.appendChild(h4)
           screen.appendChild( document.createElement('br'))
           screen.appendChild(img)
        }

        function getNextSponsor(screen_id, type_filter){
          var next = 0
          if($defined(next_slide[screen_id])){
             next = next_slide[screen_id] + 1
             if(next >= sponsors.length) next = 0
          }
          sponsor = sponsors[next]
          while(type_filter.contains( sponsor.type ) == false ){
            next = next + 1
            if(next >= sponsors.length) next = 0;
            sponsor = sponsors[next]
          }
          next_slide[screen_id] = next
          return sponsor;
        }

        function getSponsorName(s){
          if( s.type != "Sponsor")
            return s.type
          else
           return s.level + " Sponsor"
        }


     function displayMenu(menuid) {
         if(menuExists(menuid)){
         if(menuid == currentMenu) return;
         nextMenu = menuid;
         if(currentMenu){
           currentMenu = null;
           slider.slideOut();
         }
         else{
           currentMenu = nextMenu;
           prepMenu(currentMenu);
           slider.slideIn();
         }
       }
       else{
         currentMenu = null;
         nextMenu = null;
         slider.slideOut();
       }
     }

     function menuExists(id){
         if(id)
             return (document.getElementById(id) != null);
         else
             return false;
     }

     function createOnCompleteSlide(){
       return function (){
        if(nextMenu){
          if(currentMenu == null){
            currentMenu = nextMenu;
            prepMenu(currentMenu);
            slider.slideIn();
          }
         }
       }
     }

    function createScrollComplete(container, toElement){
       return function() {
        $(container).scrollTo(0,0);
        scroller.toElement(toElement)
       }
     }

     function prepMenu(menuid){
       var menu = document.getElementById(menuid);
       var target = document.getElementById("submenu");
       copy(menu,target);

     }

     function copy(src, dest){
       removeChildren(dest);
       for(i=0; i < src.childNodes.length;i++){
          var child = src.childNodes[i];
          var childCopy = child.cloneNode(true);
          dest.appendChild(childCopy);
       }
     }

     function removeChildren(element){
       if ( element.hasChildNodes() ){
         while ( element.childNodes.length >= 1 ){
            element.removeChild( element.firstChild );
         }
       }
     }