Get iPad innerHeight of page without toolbar

Hello,

I need to get innerHeight on iPad 2 display. So I need viewport of browser.

I've tried screen.height and on portrait mode returns me 1024, then tried screen.innerHeight, but returns undefined.

Then tried window.height and returns undefined also, but window.innerHeight returns wrong value.. For me 645px.

I'm using Safari to browse, and I guess toolbar isn't more than 100px.

Best regards.