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 = (argc > 2) ? argv[2] : null;
	var path = (argc > 3) ? argv[3] : null;
	var domain = (argc > 4) ? argv[4] : null;
	var secure = (argc > 5) ? argv[5] : false;
	document.cookie = name + "=" + escape (value) +
	((expires == null) ? "" : ("; expires=" + expires.toGMTString())) +
	((path == null) ? "" : ("; path=" + path)) +
	((domain == null) ? "" : ("; domain=" + domain)) +
	((secure == true) ? "; secure" : "");

}
function DeleteCookie (name) {
	var exp = new Date();
	exp.setTime (exp.getTime() - 1);
	var cval = GetCookie (name);
	document.cookie = name + "=" + cval + "; expires=" + exp.toGMTString();
}

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

	return unescape(document.cookie.substring(offset, endstr));
}


function showHelp() {

	obj = document.getElementById("help"); obj.style.display = "block";
  obj = document.getElementById("show_help"); obj.style.display = "none";

	var expDays = 1;
	var exp = new Date();
	exp.setTime(exp.getTime() + (expDays*24*60*60*1000));
	DeleteCookie('menu');
	SetCookie('menu', 1, exp);

}

function hideHelp() {

  obj = document.getElementById("help"); obj.style.display = "none";
  obj = document.getElementById("show_help"); obj.style.display = "block";

	var expDays = 1;
	var exp = new Date();
	exp.setTime(exp.getTime() + (expDays*24*60*60*1000));
	DeleteCookie('menu');
	SetCookie('menu', 0, exp);

}

function define_help(){

	var instrucoes = GetCookie('menu');

	if(instrucoes != null){
		if(instrucoes == 1)
		  showHelp();
		else
		  hideHelp();
	}
	else{
		showHelp();
	}	


}