Need help with parent/child menus overlapping

I am looking for some help. Site I have inherited is sugarlandice.com. Our page horizontal menu with certain drop downs have child sub menus. When highlighted these menus drop down and overtop the parent menu instead of moving/floating to the right where I would like to see them. I'm sorta a noob with CSS but can do what I need to if I know where to look or how to edit. I'm very new to the Ata theme. Have been reading this forum all day and have not exactly found anything to help me with this issue. I need help with:

1. Getting page/sub page menus to display properly as I mentioned above.
2. Get the odd sizing of each page to become the same width instead of just the length of the word inside. Also the same for the main horizontal bar itself.

I would be grateful for any assistance. I am using Firefox and have Firebug (although not sure I know that I am using it properly). Dont know if what CSS inserts I put in theme editor work? Using Ata theme 3.2 I believe.