if(document.images) {
        ccover = new Array(5);
        ccout = new Array(5);
        ccover[1]=new Image;
        ccout[1]=new Image;
        for(var n=2;n<=5;n++) {
                ccover[n]=new Image;
                ccout[n]=new Image;
        }
        for(var n=1;n<=5;n++) {
                ccover[n].src="images/layout/"+n+"b.gif";
                ccout[n].src="images/layout/"+n+".gif";
        }
      }

      function ccOn(i) {
        if(document.images) document.images["cc" + i].src=ccover[i].src;
      }
      function ccOff(i) {
        if(document.images) document.images["cc" + i].src=ccout[i].src;
      }