Cant use getSVGDocument() in IE

This is the part of the script I use with SVG, no problem in FF or
Chrome, the shape "chaco" changes its color to white, in IE it goes
until  alert("SVG contentDocument 2!"); when I use the developer tools
and execute mySVG.getSVGDocument(); it throws : "Object doesn't support
this property or method", no errors in previous code.
Any idea on what I can try to solve this?
thank you!

    <script src="libs/svgweb/svg.js"></script>

<!--[if !IE]>-->
   <object data="ArgCABAyNombres1.svg" type="image/svg+xml"
           width="630" height="1080" id="mySVGObject" > <!--<![endif]-->
<!--[if lt IE 9]>
   <object src="ArgCABAyNombres1.svg" classid="image/svg+xml"
           width="630" height="1080" id="mySVGObject" > <![endif]-->
<!--[if gte IE 9]>
   <object data="ArgCABAyNombres1.svg" type="image/svg+xml"
           width="630" height="1080" id="mySVGObject" > <![endif]-->
   </object>
  <script>
  var mySVG = document.getElementById("mySVGObject");
  var svgDoc;

function carga() {

        alert("SVG contentDocument 2!");
       var SD=mySVG.getSVGDocument();
       alert("SVG contentDocument Loaded!");
       E=SD.getElementById('Chaco');
       E.style.fill='#ffffff';
       alert("SVG contentDocument Loaded!");
  };

window.onsvgload = function() {
   carga();
}

  </script>




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