jQuery.preloadImages = function()
{
  for(var i = 0; i < arguments.length; i++)
  {
    jQuery("<img>").attr("src", arguments[i]);
  }
}

$.preloadImages("http://www.graylinecancun.com/images-nav/nm_BASE.jpg", 
 "http://www.graylinecancun.com/images-nav/nm_PROGRESO.jpg",
 "http://www.graylinecancun.com/images-nav/nm_MAYAN_RIV.jpg",
 "http://www.graylinecancun.com/images-nav/nm_UXMAL.jpg",
 "http://www.graylinecancun.com/images-nav/nm_CANCUN.jpg",
 "http://www.graylinecancun.com/images-nav/nm_COZUMEL.jpg",
 "http://www.graylinecancun.com/images-nav/nm_YUCATAN.jpg", "http://www.graylinecancun.com/images-nav/nm_CHICHEN_ITZA.jpg",
 "http://www.graylinecancun.com/images-nav/nm_DETAIL_MAP.jpg");