$(document).ready(function(){
     $('.button-submit').hover(
          function(){
               $(this).attr('src',$(this).attr('src').replace(".gif", "-hover.gif"));
          },
          function(){
               $(this).attr('src',$(this).attr('src').replace("-hover.gif", ".gif"));
          }
     )
     $('.button').hover(
          function(){
               $(this).attr('src',$(this).attr('src').replace(".gif", "-hover.gif"));
          },
          function(){
               $(this).attr('src',$(this).attr('src').replace("-hover.gif", ".gif"));
          }
     )

     function fixLayout(){
          if ($('#content') && $('#double')) $('#double').height($('#content').height());
     }
     fixLayout();

     $('#content').resize(fixLayout());
     $(window).resize(fixLayout());
     $(window).onresize(fixLayout());
})