flagRubrique = "";

function swapClasses( layerName, className ){
 if (navigator.appName.indexOf("Microsoft")!=-1) {
  document.all[layerName].className = className;
 }else{
  document.getElementById( layerName ).className = className;
 }
}

function openRubrique( rubriqueName ){
	 if (navigator.appName.indexOf("Microsoft")!=-1) {
	  document.all["contenu"].src = rubriqueName + ".html";
	 }else{
	  document.getElementById( "contenu" ).src = rubriqueName + ".html";
	 }
	if( flagRubrique != "" && flagRubrique != rubriqueName ){
		swapClasses( flagRubrique, 'nav' );
	}

	if( rubriqueName != flagRubrique ){
		swapClasses( rubriqueName, 'navOn' );
		flagRubrique = rubriqueName;
	}
}