Prototype.Browser.IE6 = Prototype.Browser.IE &&   
  parseInt(navigator.userAgent.substring(navigator.userAgent.indexOf("MSIE")+5)) == 6;
  
document.observe("dom:loaded", function() {
  
   var urlStart = "./images/menu/";
   var images = {
     home   : { ie : { over : "menu_home_depress_ie6.png", out : "menu_home_ie6.png"}, notie : { over : "menu_home_depress.png", out : "menu_home.png"} },
     people   : { ie : { over : "menu_people_depress_ie6.png", out : "menu_people_ie6.png"}, notie : { over : "menu_people_depress.png", out : "menu_people.png"} },
     projects : { ie : { over : "menu_projects_depress_ie6.png", out : "menu_projects_ie6.png"}, notie : { over : "menu_projects_depress.png", out : "menu_projects.png"} },
     news   : { ie : { over : "menu_news_depress_ie6.png", out : "menu_news_ie6.png"}, notie : { over : "menu_news_depress.png", out : "menu_news.png"}},
     about  : { ie : { over : "menu_aboutus_depress_ie6.png", out : "menu_aboutus_ie6.png"}, notie : { over : "menu_aboutus_depress.png", out : "menu_aboutus.png"}}
   }
  
   if (Prototype.Browser.IE6)
   {
     $('nav.index.img').setAttribute('src', urlStart + images.home.ie.out);
     $('nav.people.img').setAttribute('src', urlStart + images.people.ie.out);
     $('nav.projects.img').setAttribute('src', urlStart + images.projects.ie.out);
     $('nav.news.img').setAttribute('src', urlStart + images.news.ie.out);
     $('nav.about.img').setAttribute('src', urlStart + images.about.ie.out);                        
   }
   
   var nav_mouseover = function(e) {
     var element = e.element() || e.srcElement;
     var url = element.getAttribute('src');
     var section  = element.parentNode.getAttribute('section');
     
     if (!Prototype.Browser.IE6) {
       var imgUrl = eval("images." + section + ".notie.over");
     } else {
       
       var imgUrl = eval("images." + section + ".ie.over");
     }
     var new_url = urlStart + imgUrl;
     element.setAttribute('src', new_url);
   };
   
   var nav_mouseout = function(e) {
      var element = e.element() || e.srcElement;
      var url = element.getAttribute('src');
      var section  = element.parentNode.getAttribute('section');
      
      if (!Prototype.Browser.IE6) {
        var imgUrl = eval("images." + section + ".notie.out");
      } else {
        var imgUrl = eval("images." + section + ".ie.out");
      }
      var new_url = urlStart + imgUrl;
      element.setAttribute('src', new_url);
    };
    
   // turn onhover for menu
   $('nav.index.img').observe('mouseover', nav_mouseover);
   $('nav.people.img').observe('mouseover', nav_mouseover);
   $('nav.news.img').observe('mouseover', nav_mouseover);
   $('nav.projects.img').observe('mouseover', nav_mouseover);
   $('nav.about.img').observe('mouseover', nav_mouseover);
   
   $('nav.index.img').observe('mouseout', nav_mouseout);
   $('nav.people.img').observe('mouseout', nav_mouseout);
   $('nav.news.img').observe('mouseout', nav_mouseout);
   $('nav.projects.img').observe('mouseout', nav_mouseout);
   $('nav.about.img').observe('mouseout', nav_mouseout);
});