Using code blocks in Javascript

Hi,

when I access an ASP control I've just to include it's client ID:
<script type="text/javascript">
...
<%= Speichern.ClientID %>
---
</script>

But how can I do this in an external js file?
When I try <script type="text/javascript" src="myjs.js">
<%= Speichern.ClientID %> eber returns null.

Is there a way to use it?

Thanks

Andre
andre72Asked:
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DalHorinekCommented:
Store it in global variable which you will use in the external file.

<script>
var client_id = <% ... %>;

</script>
<script src="external/file.js" />

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andre72Author Commented:
Is this really the only way to do so?
DalHorinekCommented:
I don't say it's only way, you can generate the external file along the web page, but I don't think that's better solution.
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