/******************************************************************** 
Muestran los campos que usan javascript solo si este esta activo
*********************************************************************/

function showJavaScript() {
	showButtons();
	setText();
}

function showButtons() {
	if (document.getElementById('botonera'))
		document.getElementById('botonera').style.display = "block";
}

function setText() {
	document.getElementById('cambioTexto').style.display = "inline";
}

/******************************************************************** 
Funcionalidad de los botones para enviar paginas, favoritos e imprimir
*********************************************************************/

function bookmark() {
	var url = document.URL;
	var titulo = 'Universidad de Sevilla';
	if ((navigator.appName=="Microsoft Internet Explorer") && (parseInt(navigator.appVersion)>=4)) {
		window.external.AddFavorite(url,titulo);
	} else {
		if(navigator.appName == "Netscape")
			window.sidebar.addPanel(titulo, url,"");
	}
}

/******************************************************************** 
Cambian el tamaņo del texto y lo mantiene durante la navegacion
*********************************************************************/

function fontSize(tam) {
	document.body.style.fontSize = tam;
	createCookie("fontsize",tam,30);
}

function loadPage() {
	var tam = readCookie("fontsize");
	document.body.style.fontSize = tam;
}

function createCookie(name,value,days) {
	if (days) {
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	} else expires = "";
	document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++) {
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return null;
}