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 <s:select list="#departmentlist" listKey="did"  listValue="dname" headerKey="" headerValue="请选择部门" name="did" cssClass="SelectStyle"/>
                               

<s:select list="#postlist"  size="10" listKey="pid" listValue="pname" name="pids" headerKey="" multiple="true" cssClass="SelectStyle" headerValue="请选择岗位"/>
           

<input type="image" src="${pageContext.request.contextPath}/css/images/save.png"/>

$().ready(function(){
	$("input[type='image']").unbind("click");
	$("input[type='image']").bind("click",function() {
	 	if($("select[name='did'] option:selected").attr("value")=="")
	 	{
	 		alert("请选择部门");
	 		return false;
	 	}else{
	 		if($("select[name='pids'] option:selected").attr("value")=="")
	 		{
	 		alert("请选择岗位");
	 		return false;
	 		}
	 	  return true;
	 	}
	});
});