function hide(el){
	var myElement = document.getElementById(el);
	myElement.style.display = "none";
}

function show(el){
	var myElement = document.getElementById(el);
	myElement.style.display = "block";
}

function showHide(el){
	var myElement = document.getElementById(el);
	if (myElement.style.display == "none"){
		show(el);
	} else {
		hide(el);
	}
}