ActiveX setup Problem

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Hi All!

I've activex control that notifies user like msn style.
I've generated .cab file using cabarc.exe and visual studio setup and deployment project. Both .cab files works but there is a problem which i cant figure out.

I placed a html code in my masterpage

<br />
   <object classid="clsid:dcf0768D-ba7a-101a-b57a-0000c0c3ed5f" codebase="http://10.10.10.16/time.cab#Version=1,0,0,0"<br />
        align="CENTER" width="270" height="26" id="T1"><br />
        <param name="Interval" value="1000"><br />
        <param name="Enabled" value="1"><br />
    </object><br />

The problem is;

First i prewiev the page, the IE asking me, to install the activex control. I hit yes and control is installed(i'm not shure about it)

And every postback IE asking me same question. How i prevent this?
And i can see my activex, in installed addons in IE.

I'm using IE8 with windows 7 and VS 2008 .Net Framework 3.5.

i wish i hope explain my problem.
p.s. sorry for the bad english.