$(function () {  
  $('.totop a')   
    // create our new span.hover and loop through anchor:
    .append('<span class="hover" />').each(function () {
      var $span = $('> span.hover', this).css('opacity', 0);      
      // when the user hovers in and out 
      $(this).hover(function () {
        // on hover
        // stop any animations currently running, and fade to opacity: 1
        $span.stop().fadeTo(400, 1);
      }, function () {
        // off hover
        // again, stop any animations currently running, and fade out
        $span.stop().fadeTo(800, 0);
      });
    });




	
});