Well, Although some of you told that it is not possible to solve the issue in my/TCH part, I'm happy to let you know that I solved this problem!
It's easy, the page hijacker was just checking "user agent string".
When it is Google bot > it was showing my page there (you know, its possible with php or languages like this),
When it is a browser> it was just redirecting the visitor to my page.
So, the only way to prevent this hijack is to deny the u15194059.onlinehome-server.com to visit my site. I run a reverse DNS lookup, found his total possible IP range, and block them via CPanel. And yes, it is working! Without redirecting, the hijacker's url is now showing a different page: http://admin.u15194059.onlinehome-server.c...ies&ID=2293
I hope after the next crawling my site will come to top again in google result.
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How I figured it out.
Use http://www.wannabrowser.com/, it will let you define your custom user string and let you browse any page. I have used Googlebot's user string there: Googlebot/2.1 (+http://www.googlebot.com/bot.html) and saw te difference.
Alternatively, you can use User Agent Switcher, a firefox add-on: http://chrispederick.com/work/useragentswitcher/
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Hope it will help if some other guy faces the same problem.