pop up form

I need pop up the pre_entry form, but I cannot use link_to because I need submit the values to load the Pre-entry form. Anybody have an idea to help me?

thanks

view:    ... <%= submit_tag "Pre-Entry"%> <%= submit_tag "Submit"%> [<%= link_to "Cancel", :action => "new" %>] ...

Controller:   def submit     if params[:commit] == "Pre-Entry"       render :action => 'pre_entry'     else ...