function zoomText(tipo){
	//inicializaciones
	obj=document.getElementById("contenido");
	if (obj.style.fontSize==""){
		obj.style.fontSize="100%";
	}
	actual=parseInt(obj.style.fontSize);
	incremento=20;
	
	//operacion
	if(tipo=="normal"){
		obj.style.fontSize="100%"
	}
	if(tipo=="aumentar"){
		valor=actual+incremento;
		obj.style.fontSize=valor+"%"
	}
	if(tipo=="disminuir"){
		valor=actual-incremento;
		obj.style.fontSize=valor+"%"
	}
}
function setActiveSS(title) { var i, a, main; for (i=0; (a = document.getElementsByTagName("link")[i]); i++) { if (a.getAttribute("rel") && a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title")) { a.disabled = true; if(a.getAttribute("title") == title) a.disabled = false; } } }
function getActiveSS() { var i, a; for (i=0; (a = document.getElementsByTagName("link")[i]); i++) { if (a.getAttribute("rel") && a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title") && !a.disabled ) return a.getAttribute("title"); } return null; }
function getPreferredSS() { var i, a; for (i=0; (a = document.getElementsByTagName("link")[i]); i++) { if (a.getAttribute("rel") && a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("rel").indexOf("alt") == -1 && a.getAttribute("title") ) return a.getAttribute("title"); } return null; }
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; }
window.onload = function(e) { var cookie = readCookie("style"); var title = cookie ? cookie : getPreferredSS(); setActiveSS(title); }
window.onunload = function(e) { var title = getActiveSS(); createCookie("style", title, 365); }
var cookie = readCookie("style");
var title = cookie ? cookie : getPreferredSS();
setActiveSS(title);

function leftAlign() { var elements = document.getElementsByTagName("p"); for(var i = 0; i < elements.length; i++) { elements.item(i).style.textAlign = "left"; } }
function justifyAlign() { var elements = document.getElementsByTagName("p"); for(var i = 0; i < elements.length; i++) { elements.item(i).style.textAlign = "justify"; } }