function tab(selTab){
	var tabs = document.getElementById("tabs").getElementsByTagName("li");
	var tabContent = getElementsByClassName("tabContent");
	for(var i=0;i<tabs.length;i++){
		tabs[i].className = "";
		tabContent[i].style.display = "none";
	}
	tabs[selTab-1].className = "selected";
	document.getElementById("tab"+selTab).style.display = "block";
}