function checkNext(vchk) {

	if (vchk=='US') {
		// show state/zip
		toggleDiv('usstate','block');
		toggleDiv('castate','none');
	} else if (vchk=='CA') {
		// show canada provence
		toggleDiv('usstate','none');
		toggleDiv('castate','block');
	} else {
		// show canada provence
		toggleDiv('usstate','none');
		toggleDiv('castate','none');
	}

}

function toggleDiv (e, r) {

	var el = document.getElementById(e);
	if (el) {
		 el.style.display = r;
	}

}