asp 提交按钮执行了两次事件

[Lizhiqino1]

提交页面：
循环生成N多带编号的图片提交按钮：
<td bgcolor="#00FFFF" valign="middle"><div align="left" class="style1"><a title="<% = FindSum(C1) %>"><input type ="image" name = "BTEnter" value = <%= C1 %> src=<% = GetFileName(C1,"C") %> onclick="this.form.action=this.form.action+'?action=<%= C1 %>';this.form.submit()"></title></div></td>
<td bgcolor="#00FFFF" valign="middle"><div align="left" class="style1"><a title="<% = FindSum(C2) %>"><input type ="image" name = "BTEnter" value = <%= C2 %> src=<% = GetFileName(C2,"C") %> onclick="this.form.action=this.form.action+'?action=<%= C2 %>';this.form.submit()"></title></div></td>
...
接受处理事件
strSQL = "Select * From UserClicks Where 1 = 0 "
rstUsersClicks.Open strSQL,conn,1,2
intPoints = rstUsers("ClickTimes")
rstUsersClicks.AddNew
rstUsersClicks("IDNo") = rstUsers("IDNO")
rstUsersClicks("BlockNo") = strBlockNo
rstUsersClicks("ClickDate") = Date() + Time()
rstUsersClicks("ClickTimes") = rstUsers("ClickTimes") - 1
rstUsersClicks("ClickType") = 1
rstUsersClicks("PurchasePoints") = 1
rstUsersClicks("IPAddress") = GetIP()
rstUsersClicks.Update

rstUsersClicks一下就生成了2个相同时间内插入的记录真头痛，谁能帮忙解决下？谢谢了！！
补充：不过如果换成一般提交按钮就没问题，为什么呢？？？

[in0512]

<input type ="image" name = "BTEnter" value = <%= C1 %> src= <% = GetFileName(C1,"C") %> onclick="this.form.action=this.form.action+'?action= <%= C1 %>';this.form.submit()">

本身就是提交按钮

可以把this.form.submit()去掉