var isIE=false;
  var windowWidth=0;
  var windowHeight=0;

  if (navigator.appName.indexOf("Microsoft")>=0) isIE=true;

  function ShowMenu(menu,x) {
    if (isIE)
    {
      windowWidth = document.body.offsetWidth;
      windowHeight = document.body.offsetHeight;

      if (windowWidth>709) document.all[menu].style.left = ((windowWidth-720)/2)+x;
      else document.all[menu].style.left = x;

      document.all[menu].style.visibility = "visible";
    }
    else
    {
      windowWidth = window.innerWidth;
      windowHeight = window.innerHeight;

      if (windowWidth>709) document.getElementById(menu).style.left = ((windowWidth-700)/2)+x;
      else document.getElementById(menu).style.left = x;

      document.getElementById(menu).style.visibility = "visible";
    }

    if (menu=="pulldownmenu1") document.nav_img1.src="../img//nv_home-on.gif";
    if (menu=="pulldownmenu2") document.nav_img2.src="../img//nv_aboutus-on.gif";
    if (menu=="pulldownmenu3") document.nav_img3.src="../img//nv_gensys-on.gif";
    if (menu=="pulldownmenu4") document.nav_img4.src="../img//nv_services-on.gif";
    if (menu=="pulldownmenu5") document.nav_img5.src="../img//nv_clients-on.gif";
    if (menu=="pulldownmenu6") document.nav_img6.src="../img//nv_contact-on.gif";
	if (menu=="pulldownmenu7") document.nav_img7.src="../img//nv_join-on.gif";
  }

  function HideMenu(menu) {
    if (isIE) document.all[menu].style.visibility = "hidden";
    else document.getElementById(menu).style.visibility = "hidden";

    if (menu=="pulldownmenu1") document.nav_img1.src="../img//nv_home-off.gif";
    if (menu=="pulldownmenu2") document.nav_img2.src="../img//nv_aboutus-off.gif";
    if (menu=="pulldownmenu3") document.nav_img3.src="../img//nv_gensys-off.gif";
    if (menu=="pulldownmenu4") document.nav_img4.src="../img//nv_services-off.gif";
    if (menu=="pulldownmenu5") document.nav_img5.src="../img//nv_clients-off.gif";
    if (menu=="pulldownmenu6") document.nav_img6.src="../img//nv_contact-off.gif";
	if (menu=="pulldownmenu7") document.nav_img7.src="../img//nv_join-off.gif";
  }

  function ChangeBackground(layerName) {
    if (isIE) document.all[layerName].style.background = "url(../img//nv_hover.gif)";
    else document.getElementById(layerName).style.background = "url(../img//nv_hover.gif)";
  }

  function RestoreBackground(layerName) {
    if (isIE) document.all[layerName].style.background = "url(../img//nv_normal.gif)";
    else document.getElementById(layerName).style.background = "url(../img//nv_normal.gif)";
  }

  function preloadImages() {
    nav_img1 = new Image();
    nav_img1.src = "../img//nv_home-on.gif";

    nav_img2 = new Image();
    nav_img2.src = "../img//nv_aboutus-on.gif";

    nav_img3 = new Image();
    nav_img3.src = "../img//nv_gensys-on.gif";

    nav_img4 = new Image();
    nav_img4.src = "../img//nv_services-on.gif";

    nav_img5 = new Image();
    nav_img5.src = "../img//nv_clients-on.gif";

    nav_img6 = new Image();
    nav_img6.src = "../img//nv_contact-on.gif";
	
	nav_img7 = new Image();
    nav_img7.src = "../img//nv_join-on.gif";

	
  }

  function changeImage(img_name, img_src) {
    document.eval(img_name).src=img_src;
  }