appending parameters t querystring on the fly

[parkarumesh]

i want to attach certain parameters to a querystring on the fly. plz go
thru following

<%
ArrayList innerList = (ArrayList)activityStructure.outerList.get(i);
Description node = (Description)innerList.get(0);
if(node.userType.equals("admin"))
{
adminName = node.userName;%>
<%out.println("user = "+node.userName);
}
%>

now in the if stmt i want to redirect the user to other page with the
name of the user, i.e. node.userName attached.

so i wanna do something like

<a href="/parser/index.jsp?name=node.userName </a>

How to do