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) {
    cm_masthead_top_02_over = newImage("/images/nav/cm-masthead-top_02-over.gif");
    cm_masthead_top_03_over = newImage("/images/nav/cm-masthead-top_03-over.gif");
    cm_masthead_top_04_over = newImage("/images/nav/cm-masthead-top_04-over.gif");
    cm_masthead_11_over = newImage("/images/nav/cm-masthead_11-over.gif");
    cm_masthead_12_over = newImage("/images/nav/cm-masthead_12-over.gif");
    cm_masthead_13_over = newImage("/images/nav/cm-masthead_13-over.gif");
    cm_masthead_14_over = newImage("/images/nav/cm-masthead_14-over.gif");
    cm_masthead_19_cm_masthead_11_over = newImage("/images/nav/cm-masthead_19-cm-masthead_.gif");
    cm_masthead_20_cm_masthead_12_over = newImage("/images/nav/cm-masthead_20-cm-masthead_.gif");
    cm_masthead_21_cm_masthead_13_over = newImage("/images/nav/cm-masthead_21-cm-masthead_.gif");
    cm_masthead_22_cm_masthead_14_over = newImage("/images/nav/cm-masthead_22-cm-masthead_.gif");
    preloadFlag = true;
  }
}