How to cache the user's input in a jsp page?

[engp0510]

Hi
How to cache the user's input in a jsp page? The following is some code of my JSP:

<%
   int item_num = 5;
   int row_num  = 1;
   if(request.getParameter("row_num")!=null){
      String rowstr = (request.getParameter("row_num"));
      try{
         row_num = Integer.parseInt(rowstr);        
      }
      catch(NumberFormatException ne){}
   }
%>
...................
...................
        <TR class="LGREY">
          <TD class="L" align=right width="25%"  >Subject&nbsp; : </TD>
          <TD class="L" width="75%"  >&nbsp;
              <INPUT tabIndex=1 maxLength=100 size=40 name=subject> 
          </TD> 
        </TR>


..................
              <select size="1" name=item_num 
ONCHANGE="location=this.options[this.selectedIndex].value;">
               <%for(int i=1;i<=5;i++){%>
               <option 
value="\AddQuotation.jsp?actionfrom=<%=request_from%>&row_num=<%=i%>"<%if(row_num==i){out.print("SELECTED");}%>
 >-<%=i%>-</option>
               <%}%>
                </select>
....................
...................
           <%for(int ii=0;ii<row_num;ii++){%>
            <tr>
              <td width="25%" align="center"  ><%=ii+1%></td>
              <td width="25%" align="center"  >
                  &nbsp;<INPUT tabIndex=2 maxLength=100 size=25 
name=project_detail_<%=ii+1%>></td>
              <td width="25%" align="center"  >
                  &nbsp;<INPUT tabIndex=2 maxLength=20 size=10 
name=quantity_<%=ii+1%>></td>
              <td width="25%" align="center" >
                  &nbsp;<INPUT tabIndex=2 maxLength=20 size=10 
name=unit_price_<%=ii+1%>></td>
            </tr>     
            
           <%}%>     

The choosing of select will refresh this jsp and create the rows as many as choosed. 
But how to cache the input of "Subject"?

???? email:       <INPUT NAME="email" onChange="checkEmail(this.value)"><BR>

Can I do this without using javascript?