var curnav = 1;
function showContainer(num) {

	
		elem = document.getElementById("container" + num);
		prevElem = document.getElementById("container" + curnav);
		prevElem.style.display = "none";
		elem.style.display = "block";
		
		curnav = num;
	
}

<!--
<!--
var curStep = 1;
var steps = new Array();
function init() {
	steps = document.getElementById("droplist").getElementsByTagName("li");
	document.getElementById("droplist").style.visibility = "visible";
}
function step(num) {
	if (num != curStep) {
		elem = document.getElementById("f" + num);
		prevElem = document.getElementById("f" + curStep);
		elem.style.display = "block";
		prevElem.style.display = "none";
		steps[curStep-1].className = "";
		steps[num-1].className = "hi";
		curStep = num;
	}
}
var curimg = 1;
function stepimg(num) {
	if (num != curimg) {
		elem = document.getElementById("img" + num);
		prevElem = document.getElementById("img" + curimg);
		elem.style.display = "block";
		prevElem.style.display = "none";
		curimg = num;
	}
}