if (document.images) {

	but0_off = new Image();
	but0_off.src = "img/arribaoff_03.gif";
	but1_off = new Image();
	but1_off.src = "img/arribaoff_04.gif";
	but2_off = new Image();
	but2_off.src = "img/arribaoff_05.gif";
	but3_off = new Image();
	but3_off.src = "img/arribaoff_06.gif";
	but4_off = new Image();
	but4_off.src = "img/arribaoff_07.gif";
	but5_off = new Image();
	but5_off.src = "img/arribaoff_08.gif";
	but6_off = new Image();
	but6_off.src = "img/arribaoff_09.gif";
	but7_off = new Image();
	but7_off.src = "img/arribaoff_10.gif";
	
	
	but0_on = new Image();
	but0_on.src = "img/arribaon_03.gif";
	but1_on = new Image();
	but1_on.src = "img/arribaon_04.gif";
	but2_on = new Image();
	but2_on.src = "img/arribaon_05.gif";
	but3_on = new Image();
	but3_on.src = "img/arribaon_06.gif";
	but4_on = new Image();
	but4_on.src = "img/arribaon_07.gif";
	but5_on = new Image();
	but5_on.src = "img/arribaon_08.gif";
	but6_on = new Image();
	but6_on.src = "img/arribaon_09.gif";
	but7_on = new Image();
	but7_on.src = "img/arribaon_10.gif";
}
	
function rollOver(name) {
	if (document.images) {
   		document.images[name].src = eval(name + "_on.src");
	}
}
 
function rollOut(name) {
	if (document.images) {
   		document.images[name].src = eval(name + "_off.src");
	}
}
function win(vble,pagina,wh,ww,scroll,toolbar) {
var ventana
ventana = window.open(pagina,vble,'toolbar='+toolbar+',height='+wh+',width='+ww+',left=80,top=80,scrollbars='+scroll);
ventana.focus();
}
function ChangeMain(menu) {
	var navA = 'navMainA';
	var navB = 'navMainB';
	 if (document.getElementById) {
	 	if ((document.getElementById(menu).className) == navA) { 
	 	document.getElementById(menu).className = navB;
		}
		else {
			document.getElementById(menu).className = navA;
		}
	 } 
} 
function ChangeSub(menu) {
	var navA = 'navSubA';
	var navB = 'navSubB';
	 if (document.getElementById) {
	 	if ((document.getElementById(menu).className) == navA) { 
	 	document.getElementById(menu).className = navB;
		}
		else {
			document.getElementById(menu).className = navA;
		}
	 } 
}