function applyCascadingDropdown(sourceId, targetId) {
	var source = document.getElementById(sourceId);
	var target = document.getElementById(targetId);
	if (source) {
		source.onchange = function() {
			if (target) displayOptionItemsByClass(target, source.value);
			jumpMenuMem(source.value)
		}
		if (target) displayOptionItemsByClass(target, source.value);
	}
}

function displayOptionItemsByClass(selectElement, className) {
	if (!selectElement.backup) {
		selectElement.backup = selectElement.cloneNode(true);
	}
	var options = selectElement.getElementsByTagName("option");
	for(var i=0, length=options.length; i<length; i++) {
		selectElement.removeChild(options[0]);
	}
	var options = selectElement.backup.getElementsByTagName("option");
	for(var i=0, length=options.length; i<length; i++) {
		if (options[i].className==className)
			selectElement.appendChild(options[i].cloneNode(true));
	}
}

function applyCascadingDropdowns() {
	applyCascadingDropdown("country", "type");
	applyCascadingDropdown("type", "state");
	applyCascadingDropdown("state", "chapter");
	applyCascadingDropdown("chapter", "none");
}

function jumpMenuMem(jumpURL){
	if (isNaN(jumpURL)) {
		eval("parent.location='"+jumpURL+"'");
	}
}

window.onload=applyCascadingDropdowns;