External Html Loader

[ctrlZ]

Ciao,
Ho preso questo tutorial da dhtm nirvana e durante la visualizzazione ho
questo errore che però non ho saputo risolvere

Riga 69
Carattere 1
'Content' non è definito

la riga è evidenziata più in basso.

<script type="text/javascript">
ns4 = (document.layers);
ns6 = (!document.all && document.getElementById);
ie4 = (document.all && !document.getElementById && !window.opera);
ie5 = (document.all && !document.fireEvent && !window.opera);
op7 = (window.opera && document.createComment) ;
w3dom = (document.getElementById || op7);

function layerSetup(parent,id,left,top,zindex,visibility) {
if(ns4) {
this.obj = (parent != null) ? parent.document[id] : document[id];
this.obj.htm = (parent != null) ? parent.document[id].document :
document[id].document;
} else if(ie4 ||ie5) {
this.obj = document.all[id].style;
this.obj.htm = document.all[id];
} else if(w3dom) {
this.obj = document.getElementById(id).style;
this.obj.htm = document.getElementById(id);
}
this.obj.left = (w3dom) ? 2 + "px" : 2;
this.obj.top = (w3dom) ? 231 +"px" : 231;
this.obj.zIndex = zindex;
this.obj.visibility = visibility;
return this.obj;
}


function defineObjects() {
page = new Object();
page.width = (ns4 || ns6 ||op7) ? innerWidth : document.body.clientWidth;
page.height = (ns4 || ns6 ||op7) ? innerHeight : document.body.clientHeight;
content = new layerSetup(null,"contentLYR",2,231,7,"visible");
sizeAnimator(content,page.width-300,page.height);
setTimeout("actionManager()",500);
}


function sizeAnimator(obj,width,height) {
if(ns4) {
obj.clip.right = width;
obj.clip.bottom = height;
} else {
obj.width = (w3dom) ? 2 + "px" : 2;
obj.height = (w3dom) ? 231 + "px" : 231;
}
}

function actionManager() {
pageManager("load_page","imm_1.htm");
}


var page_timer = null;
function pageManager() {
  var args = pageManager.arguments;
  switch(args[0]) {
case "load_page" :
content.top = (w3dom) ? 2 + "px": 2; if(ie4) {
document.frames["frameData"].document.location = args[1];}
if(w3dom) {
document.getElementById("frameData").src = args[1];
}
if(ns4) {
content.load(args[1],page.width-300);
      }
    break;
    case 'page_is_loaded' :
if(ns4) {
sizeAnimator(content,page.width-300,content.htm.height);
// window.resizeBy(1,1);
// window.resizeBy(-1,-1);
}
clearTimeout(page_timer);
page_timer = setTimeout("pageManager('display_page')",2000);
break;
    case "display_page" :
if(ie4) {
content.htm.innerHTML = document.frames['frameData'].
document.body.innerHTML;
} else if(w3dom) {
content.htm.innerHTML = window.frames.frameData.document.
getElementById('body').innerHTML;
}
break;
  }
}
</script>