text in margins

Hello,
i would like to have text in the margin (start/end region) of pages.
On an odd page the text should appear at the end region, on an even page at
the start region.
In addition this text should be linked to a block in the content area. 
Example:
Odd page:
Margin Text       Block text
Even page:
Block text        Margin text

With a table it is possible to create this margin text always on one side of
the page
Is there any possibility to get the page and create something like a if then
construct?
Thanks in advance for any answers,
Michael