function nvh(iName,iCode,iCheck){
 iHead = "img/nv_";
 iFoot = ".gif";
 document.images[iName].src = iHead + iCode + iCheck + iFoot;
}

function nvh2(iName,iCode,iCheck){
 iHead = "../img/nv_";
 iFoot = ".gif";
 document.images[iName].src = iHead + iCode + iCheck + iFoot;
}

function nvc(iName,iCode,iCheck){
 iHead = "img/nv_";
 iFoot = ".gif";
 document.images[iName].src = iHead + iCode + iCheck + iFoot;
}

function pt(iName,iCheck){
 iHead = "img/pt";
 iFoot = ".gif";
 document.images[iName].src = iHead + iCheck + iFoot;
}

function rollimg(iName,iCode,iCheck){
 iHead = "img/";
 iFoot = ".gif";
 document.images[iName].src = iHead + iCode + iCheck + iFoot;
}

function rollimg2(iName,iCode,iCheck){
 iHead = "../img/";
 iFoot = ".gif";
 document.images[iName].src = iHead + iCode + iCheck + iFoot;
}

preImg = new Image();
preImg.src = "img/nv_home_off.gif";
preImg.src = "img/nv_01_on.gif";
preImg.src = "img/nv_02_on.gif";
preImg.src = "img/nv_03_on.gif";
preImg.src = "img/nv_04_on.gif";
preImg.src = "img/nv_05_on.gif";
preImg.src = "img/nv_06_on.gif";
preImg.src = "img/nv_07_on.gif";
preImg.src = "img/nv_contact_on.gif";
preImg.src = "img/nv_link_on.gif";
preImg.src = "img/nv_link_on.gif";
preImg.src = "img/nv_sitemap_on.gif";
preImg.src = "img/pto.gif";


function newImage(arg) {
 if (document.images) {
  rslt = new Image();
  rslt.src = arg;
  return rslt;
 }
}

var preloadFlag = false;
function preloadImages() {
 if (document.images) {
  nv00_on = newImage("img/nv_home_off.gif");
  nv01_on = newImage("img/nv_01_on.gif");
  nv02_on = newImage("img/nv_02_on.gif");
  nv03_on = newImage("img/nv_03_on.gif");
  nv04_on = newImage("img/nv_04_on.gif");
  nv05_on = newImage("img/nv_05_on.gif");
  nv06_on = newImage("img/nv_06_on.gif");
  nv07_on = newImage("img/nv_07_on.gif");
  contact_on = newImage("img/nv_contact_on.gif");
  link_on = newImage("img/nv_link_on.gif");
  sitemap_on = newImage("img/nv_sitemap_on.gif");
  pt_on = newImage("img/pto.gif");
  preloadFlag = true;
 }
}