How to pass servlet parameter using encodeURL function in JSP page

Hi!!!
I have a very urgently problem.
in my JSP I have this:
<IMG border="0" src='<%=response.encodeURL("/MyImageServlet")%>'>
In this way, my servlet works fine (and I have in my page my blob-image).
But I have to pass to my servlet a list of dynamic parameter. I have tried all the possibilities like:
<IMG border="0" src='<%= (response.encodeURL("/MyImageServlet") + "?Param_name=" + sessionBean.getParamValue() + "&anotherParam" + sessionBean.getAnotherParamValue())%>'
but nothing....
In my servlet I use the init function to retrieve the initial parameters(defined in my web.xml file) in this way:
public void init(ServletConfig config) throws ServletException
super.init(config);
myParam = getInitParameter( "name_of_param");
but I retrieve only the default value (-1).
How to pass to my servlet the parameters? Please help me!
Excuse me for my english,
thank you for your help!

Hi!
Thanks for your reply!
I have tried this solution but it doesn't work!
When I do getInitParameter in the init function, the servlet take the default values...
Maybe I have wrote something wrong?
Excuse me for my english,
Thanks

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