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                <h1>Load svg using ajax - this works </h1>
<p>You can edit the contents of the svg using javascript. See the red in the background?</p>
<div id="container" style="width:100px; height:100px">

<h1>svg image loaded via src - does not work</h1>
<p>The inner workings of the svg are not accessible to javascript. No red in the background.</p>
<img id="svg2" src="" width=100/>




// copy-pasted from 
// the line below does *not* work (shown to demonstrate the use of the rest)
$("#svg2 #background").attr("fill","red");

 var svgUrl    = "";
 var container = $("#container");
function injectSvg(xmlDoc) {
   var svg = $(xmlDoc).find("svg");
  svg.attr("id", "svg1")

function startAnimation() {
// all the svg code comes here
  // the line below does work
$("#svg1 #background").attr("fill","red");
$("#svg2 #background").attr("fill","red");