// JavaScript Document
function centrar_pagina() {
	if (!document.getElementById) {
		return;
	}

	var capa = document.getElementById("pagina");
	var navegador = document.getElementById("index");
	var ancho = navegador.clientWidth;
	var alto = navegador.clientHeight;
	var izquierda = 0;
	var arriba = 0;

	if (ancho > 764) {
		izquierda = (ancho / 2) - 382;
	}
	if (alto > 380) {
		arriba = (alto / 2) - 190;
	}

	capa.style.position = "absolute";
	capa.style.left = izquierda + "px";
	capa.style.top  = arriba + "px";
}

function arrancar() {
	centrar_pagina();
}

function target_blank() {
	if (!document.getElementsByTagName) {
		return;
	}
	var anchors = document.getElementsByTagName("a");
	for (var i=0; i < anchors.length; i++) {
		var anchor = anchors[i];
		if (anchor.getAttribute("href") && anchor.getAttribute("rel") == "external") {
			anchor.target = "_blank";
		}
	}
}

function arranque() {
	target_blank();
}

function PopupCentradaMax(mypage, myname) {

winprops = 'toolbar=no,scrollbars=yes,location=no,status=yes,menubar=no,resizable=no,top=0,left=0,height=' + (screen.availHeight-58) + ',width=' + (screen.availWidth-10)
win = window.open(mypage, myname, winprops)
}

function PopupCentradaMax2(mypage, myname) {

winprops = 'toolbar=1,scrollbars=1,location=1,status=1,menubar=1,resizable=1,top=0,left=0,height=' + (screen.availHeight-28) + ',width=' + (screen.availWidth-10)
win = window.open(mypage, myname, winprops)
if (parseInt(navigator.appVersion) >= 4) { win.window.focus(); }
}

function PopupCentradaLimpia(mypage, myname, w, h, scroll) {
var winl = (screen.availWidth - w - 10) / 2;
var wint = (screen.availHeight - h - 22) / 2;
winprops2 = 'height='+h+',width='+w+',top='+wint+',left='+winl+',scrollbars='+scroll+',toolbar=no,location=no,status=no,menubar=no,resizable=no'
win = window.open(mypage, myname, winprops2)
if (parseInt(navigator.appVersion) >= 4) { win.window.focus(); }
}


function ir() {
	if (document.form1.periodicos.options[document.form1.periodicos.selectedIndex].value) {
		PopupCentradaMax2(document.form1.periodicos.options[document.form1.periodicos.selectedIndex].value,this.target)
	}	
}