Why this dont work ?

<INPUT TYPE="submit" NAME="Btn1" VALUE="Click ">
<script language=VBScript>
Sub Btn1_OnClick
 Dim str1
 str = "xxx"
 MsgBox str
<% ObjRecordset.MoveFirst %>
 str = <%=objRecordset("au_fname")%>
 strl=Cstr(str)
 MsgBox strl
End Sub

</script>

Is this possible transfer od data between Client side and Server side
scripts and how ?

I think your confused. To pass information from a form the information must
be submitted to the servlet and then processed. You seem to be mixing the
two which doesn't work because they have no knowledge of each other.

-H>
...
<form method="post" action="my-file.asp">
 <input type="submit" name="btn1" value="Click"/>
</form>
...
<H-

->
<%
 ...
 Dim Str, Res
 Str = Request.queryString("btn1")
 Res = objRecordSet("au_fname")
 Response.Write(Res)
 ...
%>
<-

What your trying can be accomplished with remote scripting but I dont think
thats what you need, if your new to ASP then why not buy a book.

--
Dominic