function getCookieVal (offset){
	var endstr = document.cookie.indexOf (";", offset);
	if (endstr == -1)
		endstr = document.cookie.length;
	return unescape(document.cookie.substring(offset, endstr));
}

function GetCookie (name){
	var arg = name + "=";
	var alen = arg.length;
	var clen = document.cookie.length;
	var i = 0;

	while (i < clen){
		var j = i + alen;
		if (document.cookie.substring(i, j) == arg)
			return getCookieVal (j);
		i = document.cookie.indexOf(" ", i) + 1;
		if (i == 0) 
		break; 
	}
	return null;
}


function SetCookie (name, value){
	var argv = SetCookie.arguments;
	var argc = SetCookie.arguments.length;
	var expires = (2 < argc) ? argv[2] : null;
	var path = (3 < argc) ? argv[3] : null;
	var domain = (4 < argc) ? argv[4] : null;
	var secure = (5 < argc) ? argv[5] : false;

	document.cookie = name + "=" + escape (value) +
	((expires == null) ? "" : ("; expires=" + expires.toGMTString())) +
	((path == null) ? "" : ("; path=" + path)) +
	((domain == null) ? "" : ("; domain=" + domain)) +
	((secure == true) ? "; secure" : "");
}

var MIN_TAMANYO = 8;
var MAX_TAMANYO = 16;
var tamanyo = GetCookie("tamanyoFuente");
if (tamanyo == null)
    tamanyo= 10;
else
	tamanyo = parseInt(tamanyo);

if (tamanyo > MAX_TAMANYO || tamanyo < MIN_TAMANYO)
    tamanyo = 10;


function setFuente(){
	$("#principal").css("font-size", tamanyo + "px");

    var segs = new Date().getTime()+(3600000*24*7);
    var fecha = new Date();
    fecha.setTime(segs);
    
    SetCookie("tamanyoFuente",tamanyo,fecha, "/");
}

function incFuente(){
    tamanyo +=1;
    if (tamanyo > MAX_TAMANYO)
        tamanyo = MAX_TAMANYO;
    setFuente();
}

function decFuente(){
    tamanyo -=1;
    if (tamanyo < MIN_TAMANYO)
        tamanyo = MIN_TAMANYO;
    setFuente();
}