Update Cart Page

i am using following code to display purchansed items...

<tr bgcolor=#ffffff>
<td class=h1 class=stocktextfont><b><%=RS("cnt")%></td>
<td class=h1><b><input type=text name=qty<%=RS("Order_Qty")%> class=stocktextfont size=2 value=<%=RS("Order_Qty")%> maxlength=2></td>
<td class=h1><%=RS("Order_Item")%> <input type=hidden name=pname value="<%=RS("Order_Item")%>"></td>
<td class=k1><input type=text name="pval" class=stocktextform size=5 value=<%=RS("Order_Amount")%>></td>
<td class=h1><input type=button name=but value="Update" class=stockbuttonfont2></td>
</tr>

in this i get sr.no by <%=RS("cnt")%> which keeps increasing by 1. when i change some quantity how to capture in next page as i wont be knowing how many itesm are displayed in this page and which item user wants to update.