$(document).ready(function() {
  // image rollover animations
  $('.image-rollover').hover(
    function(){
      var imgName = $(this).attr('src').replace('.png', '-hover.png') 
      $(this).attr('src', imgName);
    },
    function(){
      var imgName = $(this).attr('src').replace('-hover.png', '.png')
      $(this).attr('src', imgName);
    }
  );
  
  // header drop-down menu animation
  $('.shopnav').hover(
    function(){
      $('.subnav').slideDown('fast');
    },
    function(){
      $('.subnav').hide();
    }
  );
});