function newImage(arg) {

  if (document.images) {

    rslt = new Image();

    rslt.src = arg;

    return rslt;

  }

}



function changeImages() {

  if (document.images && (preloadFlag == true)) {

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

      document[changeImages.arguments[i]].src = changeImages.arguments[i+1];

    }

  }

}



var preloadFlag = false;

function preloadImages() {

  if (document.images) {

    sitelogo_02_over = newImage("images/osteoporose/common/sitelogo_02_over.gif");

    sitelogo_03_over = newImage("images/osteoporose/common/sitelogo_03_over.gif");

    sitelogo_04_over = newImage("images/osteoporose/common/sitelogo_04_over.gif");

    sitelogo_05_over = newImage("images/osteoporose/common/sitelogo_05_over.gif");

    menu_01_over = newImage("images/osteoporose/patient_site/nl/menu_01_over.gif");

    menu_02_over = newImage("images/osteoporose/patient_site/nl/menu_02_over.gif");

    menu_03_over = newImage("images/osteoporose/patient_site/nl/menu_03_over.gif");

    menu_04_over = newImage("images/osteoporose/patient_site/nl/menu_04_over.gif");

    menu_05_over = newImage("images/osteoporose/patient_site/nl/menu_05_over.gif");

    preloadFlag = true;

  }

}