function externalLinks() { 
      
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          if (anchor.getAttribute("href")) {
            var external = /external/;
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      window.onload = externalLinks; 
      
      function movein(f) {
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        obrazek = f.getElementsByTagName("img")[0];
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        switch (jmeno) {
          case "kristalove": obrazek.src = "graphic/kristalove-lustry-over.jpg";
          break;
          case "terezianske": obrazek.src = "graphic/terezianske-lustry-over.jpg";
          break;
          case "moderni": obrazek.src = "graphic/moderni-lustry-over.jpg";
          break;
          case "strassove": obrazek.src = "graphic/strassove-lustry-over.jpg";
          break;  
          case "nastenne": obrazek.src = "graphic/nastenne-lustry-over.jpg";
          break;        
          case "materialy": obrazek.src = "graphic/materialy-over.jpg";
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        obrazek = f.getElementsByTagName("img")[0];
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          case "moderni": obrazek.src = "graphic/moderni-lustry.jpg";
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          case "nastenne": obrazek.src = "graphic/nastenne-lustry.jpg";
          break;
          case "materialy": obrazek.src = "graphic/materialy.jpg";
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