function view(ele) {
	switch(ele) {
		case "liv1":
		var active = document.getElementById(ele);
		active.style.visibility = "visible";
		document.getElementById("liv2").style.visibility = "hidden";
		document.getElementById("liv3").style.visibility = "hidden";
		document.getElementById("liv4").style.visibility = "hidden";
		break;
		case "liv2":
		var active = document.getElementById(ele);
		active.style.visibility = "visible";
		document.getElementById("liv1").style.visibility = "hidden";
		document.getElementById("liv3").style.visibility = "hidden";
		document.getElementById("liv4").style.visibility = "hidden";
		break;
		case "liv3":
		var active = document.getElementById(ele);
		active.style.visibility = "visible";
		document.getElementById("liv2").style.visibility = "hidden";
		document.getElementById("liv1").style.visibility = "hidden";
		document.getElementById("liv4").style.visibility = "hidden";
		break;
		case "liv4":
		var active = document.getElementById(ele);
		active.style.visibility = "visible";
		document.getElementById("liv2").style.visibility = "hidden";
		document.getElementById("liv3").style.visibility = "hidden";
		document.getElementById("liv1").style.visibility = "hidden";
		break;
	}
}