if (document.images) {
    img1on = new Image();
    img1on.src ="/common/inc_design/img/menu1_on.gif";
    img1off = new Image();
    img1off.src ="/common/inc_design/img/menu1_off.gif";

	 img2on = new Image();
    img2on.src ="/common/inc_design/img/menu2_on.gif";
    img2off = new Image();
    img2off.src ="/common/inc_design/img/menu2_off.gif";

	 img3on = new Image();
    img3on.src ="/common/inc_design/img/menu3_on.gif";
    img3off = new Image();
    img3off.src ="/common/inc_design/img/menu3_off.gif";

	 img4on = new Image();
    img4on.src ="/common/inc_design/img/menu4_on.gif";
    img4off = new Image();
    img4off.src ="/common/inc_design/img/menu4_off.gif";

	 img5on = new Image();
    img5on.src ="/common/inc_design/img/menu5_on.gif";
    img5off = new Image();
    img5off.src ="/common/inc_design/img/menu5_off.gif";

	 img6on = new Image();
    img6on.src ="/common/inc_design/img/menu6_on.gif";
    img6off = new Image();
    img6off.src ="/common/inc_design/img/menu6_off.gif";

	 img7on = new Image();
    img7on.src ="/common/inc_design/img/menu7_on.gif";
    img7off = new Image();
    img7off.src ="/common/inc_design/img/menu7_off.gif";

	 img8on = new Image();
    img8on.src ="/common/inc_design/img/menu8_on.gif";
    img8off = new Image();
    img8off.src ="/common/inc_design/img/menu8_off.gif";
}

function turnOn(imageName) {
    if (document.images) {
      document[imageName].src = eval(imageName + "on.src");
    }
}

function turnOff(imageName) {
    if (document.images) {
      document[imageName].src = eval(imageName + "off.src");
    }
}

function MM_reloadPage(init) {  //reloads the window if Nav4 resized
  if (init==true) with (navigator) {if ((appName=="Netscape")&&(parseInt(appVersion)==4)) {
    document.MM_pgW=innerWidth; document.MM_pgH=innerHeight; onresize=MM_reloadPage; }}
  else if (innerWidth!=document.MM_pgW || innerHeight!=document.MM_pgH) location.reload();
}
MM_reloadPage(true);


function MM_findObj(n, d) { //v4.0
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && document.getElementById) x=document.getElementById(n); return x;
}

function MM_showHideLayers() { //v3.0
  var i,p,v,obj,args=MM_showHideLayers.arguments;
  for (i=0; i<(args.length-2); i+=3) if ((obj=MM_findObj(args[i]))!=null) { v=args[i+2];
    if (obj.style) { obj=obj.style; v=(v=='show')?'visible':(v='hide')?'hidden':v; }
    obj.visibility=v; }
}
<!---------->