toolbar

Question

CS:
this.tbar.Attributes.Add("OnButtonClick", "javascript:buttonClick()");ASPX:
<iewc:Toolbar ID="tbar" Style="border-color: #234 #87b3d0 #87b3d0; background: #3B73A8;
                        height: 24px; width: 100%; border-width: 1px" runat="server" DefaultStyle="color:white;font-size:9pt;border-color:#3B73A8;"  >
                        <iewc:ToolbarLabel ID="lblUser" DefaultStyle="padding-right:146px;font-weight:bold;">
                        </iewc:ToolbarLabel>
                        <iewc:ToolbarButton Text="首页" ID="btn0"></iewc:ToolbarButton>
                        <iewc:ToolbarLabel Text="&lt;img src='images/sepline.jpg'&gt;"></iewc:ToolbarLabel>
                        <iewc:ToolbarButton Text="信息中心" ID="btn1"></iewc:ToolbarButton>
                        <iewc:ToolbarLabel Text="&lt;img src='images/sepline.jpg'&gt;"></iewc:ToolbarLabel>
                        <iewc:ToolbarButton Text="我的任务" ID="btn2"></iewc:ToolbarButton>
                        <iewc:ToolbarLabel Text="&lt;img src='images/sepline.jpg'&gt;"></iewc:ToolbarLabel>
                        <iewc:ToolbarButton Text="我的日程" ID="btn3"></iewc:ToolbarButton>
                        <iewc:ToolbarLabel Text="&lt;img src='images/sepline.jpg'&gt;"></iewc:ToolbarLabel>
                        <iewc:ToolbarButton Text="我的短消息" ID="btn4"></iewc:ToolbarButton>
                        <iewc:ToolbarLabel Text="&lt;img src='images/sepline.jpg'&gt;"></iewc:ToolbarLabel>
                        <iewc:ToolbarButton Text="联系人" ID="btn5"></iewc:ToolbarButton>
                        <iewc:ToolbarLabel Text="&lt;img src='images/sepline.jpg'&gt;"></iewc:ToolbarLabel>
                        <iewc:ToolbarButton Text="系统设置" ID="btn6"></iewc:ToolbarButton>
                        <iewc:ToolbarLabel Text="&lt;img src='images/sepline.jpg'&gt;"></iewc:ToolbarLabel>
                        <iewc:ToolbarButton Text="用户管理" ID="btn7"></iewc:ToolbarButton>
                        <iewc:ToolbarLabel Text="&lt;img src='images/sepline.jpg'&gt;"></iewc:ToolbarLabel>
                        <iewc:ToolbarButton Text="帮助" ID="btn8"></iewc:ToolbarButton>
                        <iewc:ToolbarLabel Text="&lt;img src='images/sepline.jpg'&gt;"></iewc:ToolbarLabel>
                        <iewc:ToolbarButton Text="退出" ID="btn9"></iewc:ToolbarButton>
                    </iewc:Toolbar>JS:
function buttonClick(){
var btnid=event.srcNode.getAttribute("ID");
switch (btnid){
case "btn0":mf.location="board.aspx?listUrl=home.aspx";break;
case "btn1":mf.location="board.aspx?listUrl=InfoCenter.aspx";break;
case "btn2":mf.location="board.aspx?listUrl=taskList.aspx";break;
case "btn3":mf.location="board.aspx?listUrl=myCalendar.aspx";break;
case "btn4":mf.location="board.aspx?listUrl=mysms.aspx";break;
case "btn5":mf.location="board.aspx?listUrl=contactList.aspx";break;
case "btn6":mf.location="board.aspx?listUrl=Admin.aspx";break;
case "btn7":location="orgAdmin.aspx";break;
case "btn8":showHelp();break;
default:__doPostBack('tbar',event.flatIndex);
}
if(btnid=="btn5"){
treeVisible=($("ldiv").style.display!="none");
}
else {
if (btnid!="btn8" && btnid!="btn9") {
if(treeVisible==true && $("ldiv").style.display=="none") viewTree();
}
}
}
为什么一个按钮都不能点？哪里有问题？