// preload cta hover images
$.preloadImages = function()
{
  for(var i = 0; i<arguments.length; i++)
  {
    $("<img>").attr("src", '_images/' + arguments[i]);
  }
}

$.preloadImages("your-it-department-home-hover.jpg", "technical-coordinator-home-hover.jpg",
"data-backup-home-hover.jpg");