I've been asked to do a CSS dropdown menu which i fear so much due to its cross browser compatibility issues and so much more.. and i've been pullin all hair out trying to figure out this problem

if you view the site here

the dropdown menu is on the green bar, Home, Domain Names and so on..

the problem that i have now is, sometimes when u mouseover on the top menu (say Hosting Accounts), the submenu will pop out but it will disappear when u mouseover on it to start navigating.. it only happens once in a while (sometimes all the time!!)...

does anyone here faces the same problem? or am i just imagining things?

and if im not imagining things, does anyone have a clue why isn't it working smoothly?