Why do I get ASP 0138 errors?

You might have seen this error when using ASP to generate client-side script:  
 

Active Server Pages, ASP 0138 (0x80004005)   A script block cannot be placed inside another script block.

 
This probably happened because you did this:  
 

<script language=vbscript runat=server>   Response.Write "<script>alert('foo');</script>"   </script>

 
Or this:  
 

<script language=jscript runat=server>   Response.Write("<script>alert('foo');</script>");   </script>

 
 

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One way to alleviate this is to use the @language directive and use <%%> delimiters throughout:  
 

<% @language="vbscript" %>   <%   Response.Write "<script>alert('foo');</script>"   %>

 
Or this:  
 

<% @language="jscript" %>   <%   Response.Write("<script>alert('foo');</script>");   %>

 
 

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If you are using both languages in the same page, you may have to use this alternative workaround, where you break the script tags up:  
 

<script language=vbscript runat=server>   Response.Write "<scr" & "ipt>alert('foo');</scr" & "ipt>"   </script>

 
Or this:  
 

<script language=jscript runat=server>   Response.Write("<scr" + "ipt>alert('foo');</scr" + "ipt>");   </script>