function change( targetId ){
	var arrDivs = new Array("tit01", "tit02", "tit03", "tit04", "tit05", "tit06", "tit07", "tit08", "tit09");
	var i;
	for (i in arrDivs) {
		if (document.getElementById(arrDivs[i]) != null){
			if (document.getElementById(arrDivs[i]).className == "m-activo") {
				document.getElementById(arrDivs[i]).className = "m-inactivo";
			}
		}
	}		
	target = document.getElementById( targetId );
	if (target.className == "m-inactivo"){
		target.className = "m-activo";
	} else {
		target.className = "m-inactivo";
	}
}