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function navigation_bar_calc()
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// $workingperiod = 3600;
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if(!isset($_REQUEST["period"])) $_REQUEST["period"]=3600;
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if(!isset($_REQUEST["from"])) $_REQUEST["from"]=0;
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// if(isset($_REQUEST["inc"])) $workingperiod= $_REQUEST["period"]+$_REQUEST["inc"];
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// if(isset($_REQUEST["dec"])) $workingperiod= $workingperiod-$_REQUEST["dec"];