function home(){
   top.cabecera.location="index_home.html";
   top.leftFrame.location="menu_home.html";
   top.contenido.location="";
}
function news(){
   top.cabecera.location="index_home.html";
   top.leftFrame.location="menu_home.html";
   top.contenido.location="";
}
function negocio(){
   top.cabecera.location="index_news.html";
   top.leftFrame.location="menu_news.html";
   top.contenido.location="";
}
function oficina(){
   top.cabecera.location="index_oficina.html";
   top.leftFrame.location="menu_oficina.html";
   top.contenido.location="";
}
function me(){
   top.cabecera.location="index_me.html";
   top.leftFrame.location="menu_me.html";
   top.contenido.location="";
}