elementHover = function(elementId) {
  if (document.getElementById("mainNavList")) {
    var elements = document.getElementById("mainNavList").getElementsByTagName("LI");
    for (var i=0; i<elements.length; i++) {
      elements[i].onmouseover=function() {
        this.className+=" hover";
      }
      elements[i].onmouseout=function() {
        this.className=this.className.replace(new RegExp(" hover\\b"), "");
      }
    }
  }
  
  if (elementId = document.getElementById("dropdown1")) {
    var elements = document.getElementById("dropdown1").getElementsByTagName("li");
    for (var i=0; i<elements.length; i++) {
      elements[i].onmouseover=function() {
        this.className+=" hover";
      }
      elements[i].onmouseout=function() {
        this.className=this.className.replace(new RegExp(" hover\\b"), "");
      }
    }
  }
  
  if (elementId = document.getElementById("dropdown2")) {
    var elements = document.getElementById("dropdown2").getElementsByTagName("li");
    for (var i=0; i<elements.length; i++) {
      elements[i].onmouseover=function() {
        this.className+=" hover";
      }
      elements[i].onmouseout=function() {
        this.className=this.className.replace(new RegExp(" hover\\b"), "");
      }
    }
  }
  
  
  if (elementId = document.getElementById("dropdown3")) {
    var elements = document.getElementById("dropdown3").getElementsByTagName("li");
    for (var i=0; i<elements.length; i++) {
      elements[i].onmouseover=function() {
        this.className+=" hover";
      }
      elements[i].onmouseout=function() {
        this.className=this.className.replace(new RegExp(" hover\\b"), "");
      }
    }
  }
    if (elementId = document.getElementById("dropdown4")) {
    var elements = document.getElementById("dropdown4").getElementsByTagName("li");
    for (var i=0; i<elements.length; i++) {
      elements[i].onmouseover=function() {
        this.className+=" hover";
      }
      elements[i].onmouseout=function() {
        this.className=this.className.replace(new RegExp(" hover\\b"), "");
      }
    }
  }
  if (elementId = document.getElementById("dropdown5")) {
    var elements = document.getElementById("dropdown5").getElementsByTagName("li");
    for (var i=0; i<elements.length; i++) {
      elements[i].onmouseover=function() {
        this.className+=" hover";
      }
      elements[i].onmouseout=function() {
        this.className=this.className.replace(new RegExp(" hover\\b"), "");
      }
    }
  }
}
if (window.attachEvent) window.attachEvent("onload", elementHover);