function isNumberKey(evt){
	var charCode = (evt.which) ? evt.which : event.keyCode
	if (charCode > 31 && (charCode < 48 || charCode > 57))
		return false;

	return true;
}

function a(o){
	o.style.backgroundColor='#f6f6f6';
	o.style.cursor='pointer';
}
function b(o){
	o.style.backgroundColor='';
	o.style.cursor='default';
}