The colours could be applied with CSS classes in stead, which would also work in browsers with JavaScript disabled, but the interesting part here is the hover effect, which is not possible without JavaScript

Html:

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Add the following JavaScript code, together with the jQuery class:

$(document).ready(function() {
    $(".zebrastripe tr:even").css("background-color","gray").hover(
      function() {
        $(this).css("background-color","yellow");
      }, function() {
        $(this).css("background-color","gray");
      });
    $(".zebrastripe tr:odd").css("background-color","blue").hover(
      function() {
        $(this).css("background-color","yellow");
      }, function() {
        $(this).css("background-color","blue");
      });
  });