function checkSearch(thisForm) {
	if (thisForm.txtSearch.value == "") {
		alert("- Ban chua nhap tu khoa!");
		thisForm.txtSearch.focus();
		return false;
	} else {
		thisForm.submit();
		return true;
	}
}
function enterClick(ev,thisForm) {
	if (ev.keyCode == 13) {
		checkSearch(thisForm);
	} else {
		if (ev.which == 13) {
			checkSearch(thisForm);
		}
	}
	return;
}