$(document).ready(function(){
  $("#junior").hover(
    function(){
      $("#site-selector .logo").css({ "background-position": "center -340px" })
    },
    function(){
      $("#site-selector .logo").css({ "background-position": "center top" })
    }
  )
  $("#senior").hover(
    function(){
      $("#site-selector .logo").css({ "background-position": "center -160px" })
    },
    function(){
      $("#site-selector .logo").css({ "background-position": "center top" })
    }
  )
});