function switchTab(eltId) {
	var arrLinkId = [];
	var i = 0;
	while(document.getElementById("_"+i)){
		arrLinkId.push("_"+i);
		i++;
	}
	var intNbLinkElt = new Number(arrLinkId.length);
	var arrClassLink = new Array('current','ghost');
	var strContent = new String()
	for (i=0; i<intNbLinkElt; i++) {
		strContent = "tab_menu"+arrLinkId[i];
		if ( arrLinkId[i] == eltId ) {
			document.getElementById(arrLinkId[i]).className = arrClassLink[0];
			document.getElementById(strContent).className = 'on tab_content';
		} else {
			document.getElementById(arrLinkId[i]).className = arrClassLink[1];
			document.getElementById(strContent).className = 'off tab_content';
		}
	}	
}