458827 css drop down accordion menu 2

I need a horizontal menu with drop down and accordian sub nav. This needs to be clean html css and js. ie 6, 7, 8, ff chrome compatible. Need very clean coding and easy to drop into existing code. See attached badly coded menu for look feel and function. I need the menus to open on roll over not click as the sample does. the sample is kind of broken so the united states should be next to canada not floating down below like it is.