$(document).ready(function(){
   var idString;
   
    $(".m2 a:not(.s33)").hover(
      function () {
     $(this).css("background-image","url(images/11.png)");
      }, 
      function () {
     $(this).css("background-image","url(images/1.png)");
      }
    );
	
    $(".s1").hover(
      function () {
     $(this).css("background-image","url(images/22.png)");
      }, 
      function () {
     $(this).css("background-image","url(images/2.png)");
      }
    );
	
    $(".s2").hover(
      function () {
     $(this).css("background-image","url(images/44.png)");
      }, 
      function () {
     $(this).css("background-image","url(images/4.png)");
      }
    );
	
    $(".s4").hover(
      function () {
     $(this).css("background-image","url(images/33.png)");
      }, 
      function () {
     $(this).css("background-image","url(images/3.png)");
      }
    );
	
    $(".s5").hover(
      function () {
     $(this).css("background-image","url(images/55.png)");
      }, 
      function () {
     $(this).css("background-image","url(images/5.png)");
      }
    );

   });