var svgns = "http://www.w3.org/2000/svg";

function makeShape(evt) {
    if ( window.svgDocument == null )
        svgDocument = evt.target.ownerDocument;

    var shape = svgDocument.createElementNS(svgns, "path");
    shape.setAttributeNS(null, "d", "M5,5 C5,45 45,45 45,5");
    shape.setAttributeNS(null, "fill", "none");
    shape.setAttributeNS(null, "stroke", "green");
    
    svgDocument.documentElement.appendChild(shape);
}