A couple of options to consider here
1. You could use a hidden field to pass the id number using a hidden field like so:
<input type="hidden" name="idno" value="<%youridnumber%>">
2. You could write the idno to a session variable in the asp code like so"
<%Session("idno"

= "youridnumber"%>
and then when you need to call it on subsequent pages simply use
<%Response.Write Session("idno"

%>
or whatever you need to do with it.
My personal preference is to use hidden fields as it reduces processing by the server but if your site has a relatively small number of users session object should be ok.
Hope this helps.
Justin X-)
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