<!--
var nav_img_ld=0;

function nav_ld_imgs() {
	if (document.images) {  
		nav_iobj = new NavMakeArray(14);

		nav_iobj[ 0].src = "img/menu_intro_off.gif";
		nav_iobj[ 1].src = "img/menu_intro_on.gif";
		nav_iobj[ 2].src = "img/menu_temas_off.gif";
		nav_iobj[ 3].src = "img/menu_temas_on.gif";	
		nav_iobj[ 4].src = "img/menu_tab_off.gif";
		nav_iobj[ 5].src = "img/menu_tab_on.gif";
		nav_iobj[ 6].src = "img/menu_graf_off.gif";
		nav_iobj[ 7].src = "img/menu_graf_on.gif";
		nav_iobj[ 8].src = "img/menu_mapa_off.gif";
		nav_iobj[ 9].src = "img/menu_mapa_on.gif";
		nav_iobj[ 10].src = "img/menu_notas_off.gif";
		nav_iobj[ 11].src = "img/menu_notas_on.gif";
		nav_iobj[ 12].src = "img/menu_down_off.gif";
		nav_iobj[ 13].src = "img/menu_down_on.gif";
		
	nav_img_ld=1;
	}
	window.self.focus();
}

function NavMakeArray(n) {
	this.length = n;
	for (var i = 0; i< n; i++) this[i] = new Image();
	return this;
}
	
function nav_chng_img(imgName,imgNum) {
	if (nav_img_ld) {
		document [imgName].src = nav_iobj[imgNum].src;
	}
}


var img_ld=0;

function ld_imgs() {
	if (document.images) {  
		iobj = new MakeArray();
		
		img_ld=1;
	}
	window.self.focus();
}

function MakeArray(n) {
	this.length = n;
	for (var i = 0; i< n; i++) this[i] = new Image();
	return this;
}


// -->