Recently i have launched one flash online gaming portal and its working perfectly. The major issue with the site is the site comes perfectly in Chrome, Opera, IE but in Firefox and Safari the jQuery CSS sliding menu is not coming properly. Its merging with the top div. Please refer this link and see the header part you will come to know the actual issue.

See below picture: 
![Issue with firefox and safari](https://i.stack.imgur.com/VnlNA.jpg)
[Reference URL](http://www.kartoongames.com/)