Using jsp variables within JSP tag

I have a variable defined within a JSP:
<%
String cust_id = request.getParameter("cust_id");
%>
I want to use this variable as a parameter to a custom tag:
<%@ taglib uri="/tlds/DBTags.tld" prefix="db" %>
<db:MultiColumnSelect columns="c.id, c.po" name="ccar_id" table_name="ccar_headers c, ccar_rmas r" selectString="r.ccar_id = c.id AND c.cust_id = <%= cust_id %>"/>
The selectString value that is passed to my tag is:
r.ccar_id = c.id AND c.cust_id = <%= cust_id %>
The <%= cust_id %> is not replaced by the actual variable value.
How would I accomplish using this variable within my JSP tag?

Your definition of the selectString attribute must indicate that it can accept runtime expressions.
<%
String cust_id = request.getParameter("cust_id");
String selectString = new String("r.ccar_id = c.id AND c.cust_id = " + cust_id);
%>
<%@ taglib uri="/tlds/DBTags.tld" prefix="db" %>
<db:MultiColumnSelect columns="c.id, c.po" name="ccar_id" table_name="ccar_headers c, ccar_rmas r"
selectString="<%= selectString %>"/>

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~

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