function hide_main_page() {
	document.getElementById("main").style.display = "none";
	return false;
}

function show_main_page() {
	hide_sub_pages();
	document.getElementById("main").style.display = "block";
	return false;
}

function show_rules() {
   	hide_main_page();
	hide_sub_pages();
	document.getElementById("rules_main").style.display = "block";
	return false;
}

function show_faq() {
   	hide_main_page();
	hide_sub_pages();
	document.getElementById("faq_main").style.display = "block";
	return false;
}

function show_help() {
   	hide_main_page();
	hide_sub_pages();
	document.getElementById("help_main").style.display = "block";
	return false;
}

function hide_sub_pages() {
	document.getElementById("rules_main").style.display = "none";
	document.getElementById("faq_main").style.display = "none";
	document.getElementById("help_main").style.display = "none";
	return false;
}