function showField(param) {
	document.getElementById(param).style.display = "block"; 
}

function hideField(param) {
	document.getElementById(param).style.display = "none";
}
function switchField(param1, param2) {
	if (document.getElementById(param1).style.display == "block") {
		hideField(param1);
		showField(param2);
	}else{
		hideField(param2);
		showField(param1);
	}
}