$(document).ready(function() {
  $('.application-education').mouseover( function() {
      $('#image-start').attr("src", '/images/index_education.png');
  });

  $('.application-service').mouseover( function() {
      $('#image-start').attr("src", '/images/index_service.png');
  });

  $('.application-assetmanagement').mouseover( function() {
      $('#image-start').attr("src", '/images/index_asset_management.png');
  });

  $('.application-engineering').mouseover( function() {
      $('#image-start').attr("src", '/images/index_engineering.png');
  });

  $('.application-valves').mouseover( function() {
      $('#image-start').attr("src", '/images/index_valves.png');
  });
});