$(document).ready( function () {
    $("#nav-about").hover(
      function () { $(this).attr('src', "/img/nav/about-ro.png"); }, 
      function () { $(this).attr('src', "/img/nav/about.png"); }
    );     

    $("#nav-conference").hover(
      function () { $(this).attr('src', "/img/nav/conference-ro.png"); }, 
      function () { $(this).attr('src', "/img/nav/conference.png"); }
    );  
    
    $("#nav-events").hover(
      function () { $(this).attr('src', "/img/nav/events-ro.png"); }, 
      function () { $(this).attr('src', "/img/nav/events.png"); }
    );  

    $("#nav-partners").hover(
      function () { $(this).attr('src', "/img/nav/partners-ro.png"); }, 
      function () { $(this).attr('src', "/img/nav/partners.png"); }
    );  

    $("#nav-newsletter").hover(
      function () { $(this).attr('src', "/img/nav/newsletter-ro.png"); }, 
      function () { $(this).attr('src', "/img/nav/newsletter.png"); }
    );      
    /*
    $(".microsponsor-button").hover(
      function () { $(this).attr('src', "/img/buttons/microsponsor-lg.png"); },
      function () { $(this).attr('src', "/img/buttons/microsponsor-ro.png"); }
    );
    */
  
  });