size of HTML5 offline cache

Is there any way how to save larger amount of files into html5 app cache?I have a site w开发者_运维百科ith plenty of images and when I put it into my manifest file, browser says it will exceed the quota.. And on the iPad seems to be the default value set on 5MB..is possible to change it?

Thanks

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iOS 6 increases the app cache from 5MB to 25MB (in the iOS 6 beta 4 release notes).

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As of today, there isn't a consistent way for developers to go beyond the typical 5 meg limit. Some browsers will prompt users to increase the limit, but others won't.