Adding a SVG doc from a String to a SVG document using javascript

Hi! My Javascript function receives a String as a parameter. This String is a svg tag with several nodes as children. I want to parse it into a SVG and add it as a nodechildren to my SVG file is:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11-flat-20030114.dtd">
<svg xmlns="http://www.w3.org/2000/svg"  xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1" height="100%" width="100%" onload="inicia(evt)" >

<script type="text/ecmascript"><![CDATA[      

parent.pinta=pinta

function inicia(event){
    SVGDocument =  event.target.ownerDocument;                                 
}

function pinta(strSVG){
    xmlDoc=new ActiveXObject("Microsoft.XMLDOM");
    xmlDoc.async=false;
    xmlDoc.loadXML(strSVG);
    var newNode=xmlDoc.documentElement;
    SVGDocument.getElementById('grafico1').appendChild(newNode);
}
]]></script>
<svg y="" width="" height="" id="grafico1"/>
<svg y="500" width="" height="" id="grafico2"/>
<g id="tip_Cuadro"/>
<g id="tip_texto"/>
</svg>

Where strSVG="<g id='titulo'><text x='95' y='12'>Title </text></g>"

But this returns a HIERARCHY_REQUEST_ERR (3) On: SVGDocument.getElementById('grafico1').appendChild(newNode); 

I think the proble is to parse String to a valid SVG node....
This is on IE9.
Thank you!






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