function change() {
		document.getElementById("mainText").innerHTML="Goodbye, World!";
	}

	var eName = "";
	
	function tooltipOn(elemName) {
		document.getElementById(elemName).style.display = '';
		document.getElementById(elemName).offsetLeft = document.getElementById(elemName + "btn").offsetLeft;
	}

	function tooltipOff(elemName) {
		document.getElementById(elemName).style.display = 'none';
	}