função ajax pra abrir página em 3 divs

Bom dia!

estou com uma super dificuldade em fazer com que a partir de um botão flash abra conteudos em tres divs diferentes.

Funciona normalmente quando clico a partir de botao normal, mas do flash...alguem me ajuda por favor?

E tbm funciona qdo tem uma div só.

Se ajudar o erro que está dando é 'document.getElementById()' é nulo ou não é um objeto

MUITO OBRIGADA!

html

<ol id="toc">
 <li><a href="#Page_1">CATEGORIA1</a></li>
 <li><a href="#Page_2">CATEGORIA2</a></li>
 <li><a href="#Page_3">CATEGORIA3</a></li>
	</ol>
	<div class="content" id="Page_1"></div>
	<div class="content" id="Page_2"></div>
	<div class="content" id="Page_3"></div>

AJAX

<script type="text/javascript">
/***********************************************

* Dynamic Ajax Content- � Dynamic Drive DHTML code library (www.dynamicdrive.com)

* This notice MUST stay intact for legal use

* Visit Dynamic Drive at http://www.dynamicdrive.com/ for full source code

***********************************************/

var bustcachevar=1 //bust potential caching of external pages after initial request? (1=yes, 0=no)

var loadedobjects=""

var rootdomain="http://"+window.location.hostname

var bustcacheparameter=""

function AbrirPagina(url, containerid){

var page_request = false

if (window.XMLHttpRequest) // if Mozilla, Safari etc

page_request = new XMLHttpRequest()

else if (window.ActiveXObject){ // if IE

try {

 page_request = new ActiveXObject("Msxml2.XMLHTTP")

	} catch (e) {

 try{

 page_request = new ActiveXObject("Microsoft.XMLHTTP")

 } catch (e){}
	}

} else

	return false

page_request.onreadystatechange=function(){

	loadpage(page_request, containerid)

}

if (bustcachevar) //if bust caching of external page

	bustcacheparameter=(url.indexOf("?")!=-1)? "&"+new Date().getTime() : "?"+new Date().getTime();

page_request.open('GET', url+bustcacheparameter, true);

page_request.send(null);

//sets the form with the values chosen by user

var x=document.getElementById("idEst");
var i;
for (i=0;i<x.length;i++)

{
if(x.options[i].value==url.substring(33, 35)){

 x.options.selectedIndex=i;
	}
}
combo_cidade(url.substring(33, 35));
combo_bairro(0);

}

function loadpage(page_request, containerid){

if (page_request.readyState == 4 && (page_request.status==200 || window.location.href.indexOf("http")==-1))

document.getElementById(containerid).innerHTML=page_request.responseText

}

function loadobjs(){

if (!document.getElementById)

return

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

var file=arguments[i]

var fileref=""

if (loadedobjects.indexOf(file)==-1){ //Check to see if this object has not already been added to page before proceeding

if (file.indexOf(".js")!=-1){ //If object is a js file

fileref=document.createElement('script')

fileref.setAttribute("type","text/javascript");

fileref.setAttribute("src", file);

}

else if (file.indexOf(".css")!=-1){ //If object is a css file

fileref=document.createElement("link")

fileref.setAttribute("rel", "stylesheet");

fileref.setAttribute("type", "text/css");

fileref.setAttribute("href", file);

}

}

if (fileref!=""){

document.getElementsByTagName("head").item(0).appendChild(fileref)

loadedobjects+=file+" " //Remember this object as being already added to page

}

}

}

</script>

BOTÃO FLASH:

on (release) {

getURL("javascript:AbrirPagina('encontrar.php?idEst=35','_Page_1')");

getURL("javascript:AbrirPagina(encontrar.php?idEst=35','_Page_2')");

getURL("javascript:AbrirPagina(encontrar.php?idEst=35','_Page_3')");

}