// Functions for contest pages

function ShowRules() {
	ShowHide("contest_rules","contest_intro");
	SetClass("intro_link", "contest_nav_btn left_btn");
	SetClass("rules_link", "contest_nav_btn_inactive");
	window.location.replace("#contest_rules");
}

function ShowIntro() {
	ShowHide("contest_intro","contest_rules");
	SetClass("intro_link", "contest_nav_btn_inactive left_btn");
	SetClass("rules_link", "contest_nav_btn");
	window.location.replace("#contest_intro");
}

function ShowHide(div1_name, div2_name) {
	var div1 = document.getElementById(div1_name);
	var div2 = document.getElementById(div2_name);
	if (div1 != null && div2 != null) {
		div1.style.display = "block";
		div2.style.display = "none";
	}
}

function SetClass(id, class_str) {
	var elem = document.getElementById(id);
	if (elem != null) {
		elem.className = class_str;
	}
}