function displayStep (whichTab, whichContent){
	var tab1 = document.getElementById("tab1");
	var tab2 = document.getElementById("tab2");
	var tab3 = document.getElementById("tab3");
	var activeTab = document.getElementById (whichTab);
	tab1.className = "off";
	tab2.className = "off";
	tab3.className = "off";
	activeTab.className = "on";
	var step1 = document.getElementById("step1");
	var step2 = document.getElementById("step2");
	var step3 = document.getElementById("step3");
	var activeStep = document.getElementById (whichContent);
	step1.className = "hideContent";
	step2.className = "hideContent";
	step3.className = "hideContent";
	activeStep.className = "showContent"; 
}

displayStep('tab1', 'step1');

document.getElementById("tab1").onclick = function () {
	displayStep('tab1', 'step1');
	return false;
}
document.getElementById("tab2").onclick = function () {
	displayStep('tab2', 'step2');
	return false;
}
document.getElementById("tab3").onclick = function () {
	displayStep('tab3', 'step3');
	return false;
}