Classic ASP, Search Recordset on pick list change

I have a classic ASP page that has a list box populated by a record set. The selected Value must be as it is. However, the record set contains another field called 'tel' that I want to use to populate a text box simultaneously. Would have been a simple task if I could change the Value to <%= RS("tel") %>, but I cannot. I need to search the record set based on "first_nm" and "last_nm". How do I do it?

<td>
					<select name="req_pvisitname" >
						<%
							Do Until RS.EOF
						%>
						<option value="<%= RS("first_nm") %> <%= RS("last_nm") %>"><%= RS("last_nm") %>,&nbsp;<%= RS("first_nm") %></option>
						<%	
							RS.MoveNext
							Loop
						%>
					</select>
                    
				</td>

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