/* page redirection */
function redirect(url) {
	window.location = url;
};
/* captcha reload */
function reloadCaptcha() {
	var captcha = document.getElementById("captcha");
	captcha.src = captcha.src+'?'+Math.random();
};
/* Pop-up para as direcções */
function popup(url, name, windowWidth, windowHeight){
    myleft = screen.width ? (screen.width-windowWidth)/2 :100;
    mytop = screen.height ? (screen.height-windowHeight)/2 : 100;
    properties = "width="+windowWidth+",height="+windowHeight+", scrollbars=yes, resizable=no, status=no, top="+mytop+", left="+myleft;
    window.open(url,name,properties);
}
/* dynamic list options */
function setOptions(o, cat) { 
	var cat2 = document.dynform.cat2; 
	cat2.options.length = 0;
	var b1 = false, b2 = false, b3 = false, b4 = false;
	switch(cat) {
		case 1:
			b1 = true; break;
		case 2:
			b2 = true; break;
		case 3:
			b3 = true; break;
		case 4:
			b4 = true; break;
	}
		
	if (o == "1") { 
		cat2.options[cat2.options.length] = new Option('Notícias', '1', b1); 
		cat2.options[cat2.options.length] = new Option('Comentários', '2', b2);
		cat2.options[cat2.options.length] = new Option('Opinião', '3', b3); 
		cat2.options[cat2.options.length] = new Option('Tomadas de Posição', '4', b4); 
	} 
	if (o == "2") { 
		cat2.options[cat2.options.length] = new Option('Textos Básicos', '1', b1); 
		cat2.options[cat2.options.length] = new Option('Textos Clássicos', '2', b2);
		cat2.options[cat2.options.length] = new Option('Esquerda Nova', '3', b3); 
	} 
	if (o == "3") { 
		cat2.options[cat2.options.length] = new Option('Vídeos', '1', b1); 
		cat2.options[cat2.options.length] = new Option('Cartazes', '2', b2);
		cat2.options[cat2.options.length] = new Option('Folhetos', '3', b3);
		cat2.options[cat2.options.length] = new Option('Outros', '4', b4);  
	} 
}