Adding an Image to svg

I am trying to add an image to a certain element within a svg in Javascript. I am trying

$( 'g.nv-label' ).each(function(i, obj){
      $( obj ).append('<image x="20" class="klasse" y="20" width="100" 
        height="100" xlink:href="http://goo.gl/IkKMb5" />');
    });

... which does not show my element.

If i try

$( 'g.nv-label' ).each(function(i, obj){  
      $( obj ).append("svg:image")
        .attr("xlink:href", "http://goo.gl/IkKMb5")
        .attr("height", 100)
        .attr("width", 100)
        .attr("class", "klasse");
 });

it adds the element, but not as a <img>, but as <g> (which does not show my image defined in the href).

Can anyone tell me how to do it right?