function goback() {
	history.back();
}
function refresh() {
	window.location.reload(true);
}
function lockform (formname) {
	ua = new String(navigator.userAgent);
	if (ua.match(/IE/g)) {
		for (i=1; i < formname.elements.length; i++) {
			if (formname.elements[i].type == 'submit') {
				formname.elements[i].disabled = true;
			}
		}
	}
	return true;
}
function unlockform (formname) {
	ua = new String(navigator.userAgent);
	if (ua.match(/IE/g)) {
		for (i=1; i < formname.elements.length; i++) {
			if (formname.elements[i].type == 'submit') {
				formname.elements[i].disabled = false;
			}
		}
	}
}