Looks like you should better use 'switch'
or use an array or so. For instance, store these values like "About the Series" in an array and use an index instead of "aboutdb ". So use an integer instead of some cryprical stringvalue
Then you could have somenthin like
If your array would look like
"0" => "About the Series"
"1" => "About the staff"
and $str = 1 then
$information = $array[$tsr]
would instantly set the rigth value for $information
<edit> posts crossed. mordreds code will be more transparent to maintain. </edit>