// ORIGEM: http://www.w3schools.com/js/js_cookies.asp
// GRAVA UM COOKIE NO NAVEGADOR
function setCookie(c_name,value,expiredays){
	var exdate = new Date();
	exdate.setDate( exdate.getDate() + expiredays );
	document.cookie = c_name + "=" + escape(value) + ((expiredays==null) ? "" : ";expires=" + exdate.toGMTString());
}

// RETORNA O VALOR DE UM COOKIE
function getCookie(c_name){
	if (document.cookie.length>0){
		c_start = document.cookie.indexOf(c_name + "=");
	  	if (c_start!=-1){ 
			c_start	= c_start + c_name.length + 1;
			c_end	= document.cookie.indexOf(";",c_start);
			if (c_end==-1) c_end = document.cookie.length;
			return unescape( document.cookie.substring(c_start,c_end) );
		} 
	}
	return "";
}