$(document).ready(function() {
    $("div[id='SitemapContainer'] a").hover(
      function() {
          callLocal(this);
      },
      function() {
          callSecond(this);
      }
    );
});

function callLocal(caller) {
    var exp = $("div[id='ExplanationContainer']");
    var site = $("div[id='SitemapContainer']");
    var theil = $(caller).parent();
    var index = site.find("li").index(theil) + 1;
    exp.find("div:nth-child(" + index + ")").css("color", "#E51C1A");
}
function callSecond(caller) {
    var exp = $("div[id='ExplanationContainer']");
    var site = $("div[id='SitemapContainer']");
    var theil = $(caller).parent();
    var index = site.find("li").index(theil) + 1;
    exp.find("div:nth-child(" + index + ")").css("color", "#3B3B3B");
}