function preloadImages() {
  if (document.images) {
    if (typeof document.CV == 'undefined'){
      document.CV = new Object();
    }
    document.CV.loadedImages = new Array();
    var argLength = preloadImages.arguments.length;
    for(arg=0;arg<argLength;arg++) {
      document.CV.loadedImages[arg] = new Image();
      document.CV.loadedImages[arg].src = preloadImages.arguments[arg];
    }
  }
}

preloadImages('img/nav_home_on.gif','img/nav_home_off.gif','img/nav_design_a_flag_on.gif','img/nav_design_a_flag_off.gif','img/nav_products_on.gif','img/nav_products_off.gif','img/nav_school_network_on.gif','img/nav_school_network_off.gif','img/nav_our_story_on.gif','img/nav_our_story_off.gif','img/nav_get_in_touch_on.gif','img/nav_get_in_touch_off.gif');

function imageSwap(img, imgSrc){
     if (typeof img == 'string') {
      objStr = 'document.' + img;
      obj = eval(objStr);
      obj.src = imgSrc;
    } else if ((typeof img == 'object') && img && img.src) {
      img.src = imgSrc;
    }
}

function toggleMenu(id){
	//menuSection = id + "Link"
	//menuImage = id + "NavImage"
  if (document.all){
    if(document.all[id].style.display == 'none'){
      document.all[id].style.display = '';
	  //document.all[menuSection].className = 'orangeMed';
	  //document.all[menuImage].src = '/img/blockOrangeSmall.gif';
	  
	} else {
      document.all[id].style.display = 'none';
	  //document.all[menuSection].className = 'greyMed';
	  //document.all[menuImage].src = '/img/blockGreySmall.gif';
    }
  } else if (document.getElementById){
    if(document.getElementById(id).style.display == 'none'){
      document.getElementById(id).style.display = 'block';
	 // document.getElementById(menuSection).className = 'orangeMed';
	 // document.getElementById(menuImage).src = '/img/blockOrangeSmall.gif';
    } else {
      document.getElementById(id).style.display = 'none';
	 // document.getElementById(menuSection).className = 'greyMed';
	 // document.getElementById(menuImage).src = '/img/blockGreySmall.gif';
    }
  }
}