if (document.images) {



  img1on = new Image();

  img1on.src = "_images/side_int_overview_on.gif";

  img1off = new Image();

  img1off.src = "_images/side_int_overview.gif";



  img2on = new Image();

  img2on.src = "_images/side_why_overview_on.gif";

  img2off = new Image();

  img2off.src = "_images/side_why_overview.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");

    }

  }

}