火狐中的 js retuen false 为什么没用啊！

[a425419956]

<p class="p2">
<asp:Button ID="move" runat="server"
Text="保存" class="mangerhoutai" OnClientClick="return chek()"
onclick="move_Click" />
<asp:Button ID="fuanhui" runat="server"
Text="返回" class="mangerhoutai" onclick="fuanhui_Click"/> </p>
</div>

</div>
<uc2:bottom ID="bottom" runat="server" />
</form>
<script language="javascript" type="text/javascript">
function chek() {
if (document.getElementById("Txt_Title").value == "") {
alert("请输入模板名称！");
form1.Txt_Title.focus();
return false;
}
if (document.getElementById("Txt_Url").value == "") {
alert("请输入模板路径！");
form1.Txt_Url.focus();
return false;
}
}
</script>