if(parent.frames.length == 0){
document.write('<frameset cols="*,771,*" frameborder="NO" border="0" framespacing="0">'
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       +'<frame src="'+ window.location +'?" name="main"/>'
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   +'</frameset>'
  +'<frame src="../frames/onder.htm" name="onder" scrolling="no" noresize id="onder">'
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+'<frame src="../frames/rechtsbuiten.htm" name="rechtsbuiten" scrolling="no" id="rechtsbuiten">'
+'</frameset>');
};