strange problem - hyperlink parameter affects rendering of page

Hi,


This is a bizarre problem.
I have a menu bar created in a master page using a list of hyperlinks. This creates a drop down sub menu effect.
Each sub menu item points to a different page with a formview. The formview is the same for each page, so I've decided to combine all the pages into one page and use a parameter instead which I pass from the hyperlink.

But now this affects the menu bar, and instead of an attractive drop down menu, it produces a list of hyperlinks at the top of the page, with no menu bar. (the rest of the page is fine, the parameter is processed correctly).

I don't understand why it's doing this. All I have added is a parameter. Why should this affect the rendering of the page?
And if I remove the parameters in the hyperlink, it's all fine again.
Any ideas would be appreciated......

Tushar

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