if (document.images) {



  img_nav_sub4_1on = new Image();

  img_nav_sub4_1on.src = "_images/nav_sub4_1over.gif";

  img_nav_sub4_2on = new Image();

  img_nav_sub4_2on.src = "_images/nav_sub4_2over.gif"; 

  img_nav_sub4_3on = new Image();

  img_nav_sub4_3on.src = "_images/nav_sub4_3over.gif";

  img_nav_sub4_4on = new Image();

  img_nav_sub4_4on.src = "_images/nav_sub4_4over.gif";

  img_nav_sub4_5on = new Image();

  img_nav_sub4_5on.src = "_images/nav_sub4_5over.gif";

  img_nav_sub4_6on = new Image();

  img_nav_sub4_6on.src = "_images/nav_sub4_6over.gif";

  img_nav_sub4_7on = new Image();

  img_nav_sub4_7on.src = "_images/nav_sub4_7over.gif";

  img_nav_sub4_8on = new Image();

  img_nav_sub4_8on.src = "_images/nav_sub4_8over.gif";

  img_nav_sub4_9on = new Image();

  img_nav_sub4_9on.src = "_images/nav_sub4_9over.gif";

  img_nav_sub4_10on = new Image();

  img_nav_sub4_10on.src = "_images/nav_sub4_10over.gif";

  img_nav_sub4_11on = new Image();

  img_nav_sub4_11on.src = "_images/nav_sub4_11over.gif";

  img_nav_sub4_12on = new Image();

  img_nav_sub4_12on.src = "_images/nav_sub4_12over.gif";

  img_nav_sub4_13on = new Image();

  img_nav_sub4_13on.src = "_images/nav_sub4_13over.gif";

  img_nav_sub4_14on = new Image();

  img_nav_sub4_14on.src = "_images/nav_sub4_14over.gif";

  

  img_nav_sub4_1off = new Image();

  img_nav_sub4_1off.src = "_images/nav_sub4_1off.gif";

  img_nav_sub4_2off = new Image();

  img_nav_sub4_2off.src = "_images/nav_sub4_2off.gif";

  img_nav_sub4_3off = new Image();

  img_nav_sub4_3off.src = "_images/nav_sub4_3off.gif";

  img_nav_sub4_4off = new Image();

  img_nav_sub4_4off.src = "_images/nav_sub4_4off.gif";

  img_nav_sub4_5off = new Image();

  img_nav_sub4_5off.src = "_images/nav_sub4_5off.gif";

  img_nav_sub4_6off = new Image();

  img_nav_sub4_6off.src = "_images/nav_sub4_6off.gif";

  img_nav_sub4_7off = new Image();

  img_nav_sub4_7off.src = "_images/nav_sub4_7off.gif";

  img_nav_sub4_8off = new Image();

  img_nav_sub4_8off.src = "_images/nav_sub4_8off.gif";

  img_nav_sub4_9off = new Image();

  img_nav_sub4_9off.src = "_images/nav_sub4_9off.gif";

  img_nav_sub4_10off = new Image();

  img_nav_sub4_10off.src = "_images/nav_sub4_10off.gif";

  img_nav_sub4_11off = new Image();

  img_nav_sub4_11off.src = "_images/nav_sub4_11off.gif";

  img_nav_sub4_12off = new Image();

  img_nav_sub4_12off.src = "_images/nav_sub4_12off.gif";

  img_nav_sub4_13off = new Image();

  img_nav_sub4_13off.src = "_images/nav_sub4_13off.gif";

  img_nav_sub4_14off = new Image();

  img_nav_sub4_14off.src = "_images/nav_sub4_14off.gif";

  

}



function changeImages() {

  if (document.images) {

    for (var i=0; i<changeImages.arguments.length; i+=2) {

      document[changeImages.arguments[i]].src = eval(changeImages.arguments[i+1] + ".src");

    }

  }

}