Flash staying power

Ok I am finding it very hard to find the answer for this question.

I have seen it implemented elsewhere, but have only been able to look at the source for the site.

It is clearly seen that in the site, the do have a few php pages. And on click of each page the flash button stays down, except they are using exactly the same navigation, looking at their source code.

for example they use something like this

<embed src=“swf/menu.swf?cualMenu=contacto”

This source was taken from the contactus page.

This bit of code : ?cualMenu=contacto

differs for each page.

There obvoiously has to be a connection somehow in order to achieve this.

Can anyone provide any tips for doing this…

Cheers

Trev