# File lib/merb-core/dispatch/default_exception/default_exception.rb, line 77
        def render_source(filename, line)
          line = line.to_i
          ret   =  []
          ret   << "<tr class='source'>"
          ret   << "  <td class='collapse'></td>"
          str   =  "  <td class='code' colspan='2'><div>"
        
          __caller_lines__(filename, line, 5) do |lline, lcode|
            str << "<a href='txmt://open?url=file://#{filename}&amp;line=#{lline}'>#{lline}</a>"
            str << "<em>" if line == lline
            str << Erubis::XmlHelper.escape_xml(lcode)
            str << "</em>" if line == lline
            str << "\n"
          end
          str   << "</div></td>"
          ret   << str
          ret   << "</tr>"
          ret.join("\n")
        end