function swapDisplay(a, b) {
			var tmp = document.getElementById(a).style.display;
			document.getElementById(a).style.display = document.getElementById(b).style.display;
			document.getElementById(b).style.display = tmp;
	}

	function submitFormTriggeringCallback(formName, callbackKey, value) {
		var ele = document.createElement("input");
		ele.type = "hidden";
		ele.name = callbackKey;
		ele.value = value;
		document.forms[formName].appendChild(ele);
		document.forms[formName].submit();
	}
	
	function chooseOther(select, hiddenId, p) {
		value = prompt(p);
		document.getElementById(hiddenId).value = value;
		select.options[select.options.length-1].text = value;
	}
	
	function enableChoice(enableID, disableID) {
		document.getElementById(enableID).disabled = false;
		document.getElementById(disableID).disabled = true;
	}