it is strange because I have pr3 for www.onlinexcasinos.com
but pr2 for http://www.onlinexcasinos.com/index.html.
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it is strange because I have pr3 for www.onlinexcasinos.com
but pr2 for http://www.onlinexcasinos.com/index.html.
The PR doesn't depend primarily on the content because the search engine spiders can't read the content. It depends more on how you make your content readable for them through keywords, descriptions, keyword density etc. And also, of course, on other factors like link popularity etc.
You should probably put an htaccess redirect in from index.html to / to redirect the link juice.