function replaceElements(whatElement,withElement) {
      whatElement.style.display = 'none';
      withElement.style.display = 'block';
  }

  var lastRowColor='';

  function setColorOver(element) {
     lastRowColor=element.style.backgroundColor;
     element.style.backgroundColor="#abcdef";
  }

  function setColorDown(element) {
     element.style.backgroundColor=lastRowColor;
  }