My suggestion is that：

1）Please export your whole ppt into the form of html。

2）Then use something like iframe or something like that to link your aspx to the ppt together……

In fact you can use Wizard control：each wizard panel should include a iframe，with a ppt there；and you can easily to control it with next，previous，last，first……

For more about Wizard control，please have a look at：http://msdn.microsoft.com/en-us/magazine/cc163894.aspx

Reguards！