function showElement(elementName,switchName) {
	if ( document.getElementById(elementName) && document.getElementById(switchName) )	{
		if (document.getElementById(switchName).checked) {
			document.getElementById(elementName).style.display = "block";
		}
		if  (document.getElementById(switchName).checked == false) {
			document.getElementById(elementName).style.display = "none";
		}
	}
}