/*MENU SUPERIOR*/
#page #layer_nav #nav li#opcion_primera{width:81px; background:url(../images/first_tab.png) 0 0 no-repeat;}
#page #layer_nav #nav li#opcion_central{width:90px; background:url(../images/third_tab.png) 0 0 no-repeat;}
#page #layer_nav #nav li#opcion_ultima{width:94px; background:url(../images/last_tab.png) 0 0 no-repeat;}

#page #layer_nav #nav li#opcion_primera.selected{background:url(../images/first_tab_selected.png) 0 0 no-repeat;}
#page #layer_nav #nav li#opcion_central.selected{background:url(../images/third_tab_selected.png) 0 0 no-repeat;}
#page #layer_nav #nav li#opcion_ultima.selected{background:url(../images/last_tab_selected.png) 0 0 no-repeat;}