Guest wrote:
<%= link_to 'Next Month' :action => 'show_month', :m => ( @month + 1), :yr => @year %>
Try...
<%= link_to 'Next Month', {:action => 'show_month', :m => ( @month + 1), :yr => @year} %>
The link_to documentation at http://api.rubyonrails.org/ explains it pretty well, I think.
hth, Bill