jQuery(document).ready(function () {
  jQuery("table.toxicsites tr:even").addClass("even");

  jQuery("table.toxicsites tr:odd").addClass("odd"); //This is not required - you can avoid this if you have a table background
  jQuery("table.toxicsites tr").hover(function(){
    jQuery(this).addClass("hovcolor");
    }, function(){
    jQuery(this).removeClass("hovcolor");
  });
  jQuery("table.toxicsites tr").click(function(){
    jQuery("table.toxicsites tr").removeClass("highlightcolor"); // Remove this line if you dont want to de-highlight the previously highlighted row
    jQuery(this).toggleClass("highlightcolor");
  });

});