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 img54on = new Image();
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 img53off = new Image();
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 img54off = new Image();
 img54off.src = "img-s-c/schodiste.jpg";

 
}

function imgOn(imgName) {
 if (document.images) {
  document[imgName].src = eval(imgName + "on.src");
 }
}

function imgOff(imgName) {
 if (document.images) {
  document[imgName].src = eval(imgName + "off.src");
 }
}