Thank you very much Charles, you perfectly got my point!
"big step" - does this mean it would not be "tiny" or run on some
Symbian mobile phone?
I tried to find out how it COULD work, but eg Firefox2 or Inkscape
does not show anything:

<?xml version="1.0" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd";>

<svg xmlns="http://www.w3.org/2000/svg";
xmlns:xlink="http://www.w3.org/1999/xlink"; width="300" height="300">
  <script type="text/ecmascript">
    <![CDATA[
      var LAT=0.1;
      function myfun(factor) {
        return(2*factor*exp(LAT));
      }
      function fun() {
        return(40);
      }    ]]>
  </script>

<circle cx="200" cy="50" r="fun(50)" stroke="black" stroke-width="2"
fill="blue"/>

<circle cx="100" cy="50" r="myfun(40)" stroke="black" stroke-width="2"
fill="red"/>

</svg>

My final goal is to create an SVG version of this wonderful graphic (not mine):
http://de.wikipedia.org/wiki/Bild:Sonnenstandsdiagramm_Wien_300dpi.png
I will post any result here, now I'm almost ready to start....  :-D

Thomas

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