Load XML into an Iframe with javascript

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ASP.NET

hello everyone,

Im trying to load my xml tree into an iframe with javascript on a bouton click
it doesnt seem to work your help will be appreciated. Here is my code:

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

    function GetXML()
     {

         var test = document.getElementById("IframeXmlErreur").src = "DocumentXML/MessageErreur.xml";


       return test;
     }

</script>


<form id="form1" runat="server">
<div align="center">

                    <asp:Button ID="BtnMessage" runat="server" Text="Afficher XML"
                        Width="134px" OnClientClick = "GetXML();"/><br /><br />
<div align="center">
    <div class="panel">
        <iframe id="IframeXmlErreur"
            style="width: 548px;" frameborder="0">
        </iframe>
</div>

</form>
</body>