var tam = 12;
	function mudaFonte(tipo){
		if (tipo=="mais") {
			if(tam<18) tam+=2;
			//createCookie('fonte',tam,365);
		} else {
			if(tam>10) tam-=2;
			//createCookie('fonte',tam,365);
		}
		document.getElementById('tx').style.fontSize = tam+'px';
}
function open_top(url, name, params, Wwidth, Wheight) {
	Swidth = screen.width;
	Sheight = screen.height;

	Wleft = (Swidth / 2) - (Wwidth / 2) - 8;
	Wtop = (Sheight / 2) - (Wheight / 2) - 20;
	
	Wtop += 40;

	params = params+",left="+Wleft+",top="+Wtop+",width="+Wwidth+",height="+Wheight;

	window.open(url, name, params);
}

function open_center(url, name, params, Wwidth, Wheight) {
	Swidth = screen.width;
	Sheight = screen.height;

	Wleft = (Swidth / 2) - (Wwidth / 2) - 8;
	Wtop = (Sheight / 2) - (Wheight / 2) - 20;

	params = params+",left="+Wleft+",top="+Wtop+",width="+Wwidth+",height="+Wheight;

	window.open(url, name, params);
}