function setHomepage(id) {
    clearInterval(rotateHomepage);
    setHomepageProduct(id);
  }
  
  function setHomepageProduct(id) {
    for (c=1;c<=4;c++) {
      if (c==id) {
        $("hst"+c).addClass('selected');
        $("hsl"+c).addClass('selected');
        $("hsi"+c).addClass('selected');
        $("hsd"+c).addClass('selected');
      } else {
        $("hst"+c).removeClass('selected');
        $("hsl"+c).removeClass('selected');      
        $("hsi"+c).removeClass('selected');      
        $("hsd"+c).removeClass('selected');      
      }
    }
  }
  
  var homepageProduct = 1;
  var rotateHomepage  = setInterval(rotateHomepage,3500);
  
  function rotateHomepage() {
    homepageProduct++;
    if (homepageProduct > 4) {
      homepageProduct = 1;
    }
    setHomepageProduct(homepageProduct);
  }