var openPanel = "1";
function changeTab() {
	var panel = arguments[0].parentNode.id.substr(3,1);
	if (openPanel != panel) {
		document.getElementById("panel" + openPanel).style.display = "none";
		document.getElementById("tab" + openPanel).className = "";
		document.getElementById("panel" + panel).style.display = "block";
		document.getElementById("tab" + panel).className = "current";
		openPanel = panel;
	}
	panel = null;
}

function goStep() {
	changeTab(document.getElementById("tab" + arguments[0]).getElementsByTagName("a")[0]);
	window.scrollTo(0,0);
}