function IsNull(it,that)
{
	var flag = true;

	if ( it.value != "" ) 
	{
		for (var i=0; i < it.value.length; i++) 
		{
			if (it.value.charAt(i) != " ") 
			{
				flag=false;
				break;
			}
		}
	}

	if ( flag == true ){
		alert(that + "(À»)¸¦ ÀÔ·ÂÇØÁֽʽÿÀ.");
		it.focus();
		return true;
	}
}