I am in a frenzy!

How do I get aspx pages to work properly on Apple Safari and Google Chrome?

I have built a large website for a friend with lots of drop-down menus and now he cant access the sub-pages on Chrome because the menus does not display. I also noticed it on Safari but thought it to be a glitch.

Seems like the aspx is a bunch of bollox.

What to do? Is there a setting that must be activated or am I screwed?