function HideContent(d) {
	if(d.length < 1) { return; }
	document.getElementById(d).style.display = "none";
}
function ShowContent(d) {
	if(d.length < 1) { return; }
	document.getElementById(d).style.display = "block";
}
function ReverseContentDisplay(d) {
	if(d.length < 1) { return; }
	if(document.getElementById(d).style.display == "none") { 
		document.getElementById(d).style.display = "block"; 
	}
	else { document.getElementById(d).style.display = "none"; }
}

function change_enable(field1, field2) {
	if (field1.disabled==false) {
		field1.disabled = true;
		field2.disabled = false;
		switch (field1.type) {
			case 'select-one': 
				field1.selectedIndex = 0;
				break;
			default:
				field1.value = "";
		}
	}
	else {
		field2.disabled = true;
		field1.disabled = false;
		switch (field2.type) {
		case 'select-one': 
			field2.selectedIndex = 0;
			break;
		default:
			field2.value = "";
		}		
	}
	return true;
}

//not working!!
function change_visible(field1, field2) {
	if (field1.style.visibility == "visible") {
		field1.style.visibility == "hidden";
		field2.style.visibility == "visible";
		switch (field1.type) {
			case 'select-one': 
				field1.selectedIndex = 0;
				break;
			default:
				field1.value = "";
		}
	}
	else {
		field2.style.visibility == "hidden";
		field1.style.visibility == "visible";
		switch (field2.type) {
		case 'select-one': 
			field2.selectedIndex = 0;
			break;
		default:
			field2.value = "";
		}		
	}
	return true;
}