if(parent.frames.length == 0){
document.write('<frameset cols="*,900,*" frameborder="NO" border="0" framespacing="0">'
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  +'<frame src="../../frames/rechts.htm" name="rechts" scrolling="no" noresize id="rechts">'
  +'</frameset>'
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+'<frame src="../../frames/rechtsbuiten.htm" name="rechtsbuiten" scrolling="no" id="rechtsbuiten">'
+'</frameset>');
};