[20081201]--the alert of required item

 <script language="javascript">

    

    function aa(){
        

                var aa = document.[form_name].[object_name];

                if((aa.value == null) || (aa.value == "")){

                        

                    alert("please input!");

       }else{

                

                    actSubmit(document.[form_name],<c:url value=""/>);

       }

    }

</script>