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document.write('<frameset cols="*,800,*">') 
document.write('<frame src="sfondob.htm" marginwidth="0" marginheight="0" scrolling="no" target="_self" noresize>') 
document.write('<frame name="centrale" src='+document.location.href+'?a marginwidth="0" marginheight="0" scrolling="auto" noresize>') 
document.write('<frame marginwidth="0" marginheight="0" scrolling="no" noresize src="sfondoc.htm" target="principale">') 
document.write('</frameset>') 

}