var section;
var barBaseName = "menu_bar_";
var barNames = ["home", "learn", "message", "about", "media"];

function showMenuBars() {
	if (!(section== null)){
		switch(section){
			case "home":
				showBars("menu_bar_home");
			break
			case "learn":
				showBars("menu_bar_home", "menu_bar_learn");
			break
			case "message":
				showBars("menu_bar_learn", "menu_bar_message");
			break
			case "about":
				showBars("menu_bar_message", "menu_bar_about");
			break
			case "media":
				showBars("menu_bar_about", "menu_bar_media");
			break
			case "partners":
				showBars("menu_bar_media");
			break
			
		}

	}
}

function showBars(bar1, bar2){
	var i;
	for (i = 0; i < barNames.length; i++){
		var id;
		id = barBaseName + barNames[i];
		
		var elem;
		elem = document.getElementById(id);
		
		if(elem){
			elem.style.visibility = "visible";
		}
	}
		
	if(!(bar1 ==  null)){
			hideBar(bar1);
	}
	
	if(!(bar2 ==  null)){
			hideBar(bar2);
	}
}

function hideBar(bar){
		if(!(bar==null)){
		var imgBar;
		imgBar = document.getElementById(bar);
		if(imgBar){
			imgBar.style.visibility = "hidden";
		}
	}
}