it's looks good, but background color for content not correct... try add something gray-white maybe and change links colors...
Well, alka, I am not sure you are allowed to use Mario, Luigi and other character. They are copyrighted and once you get noticed by someone, you will get into trouble. Then, about the design. It looks good, but I would put the navigation bar in the place of login bar because most people read from left to right and the biggest attention now is drawn to the login bar which is not what you need. I had a login option on my funsite a couple of years ago and, let's put it this way: it is extremely hard to get users registering and logging in but it is fairly easy to get them clicking on the navigation links. So, go with the easiest option, make them click through navigation.
good looking site i would most likely change the right navigation move it to the left and make it stand out more so people know its the navigation