First i suggest you not to use IDs multiple times! An ID is always a unique identifier... change your <ul id="top">
to <ul class="top">
.
And your HTML contains a lot of <font>
-Tags. Really? Are you serious? This element was deprecated in HTML 4.01!
To fix your issue remove position: relative;
from .sf-menu li
found in superfish.css line 8
/* change this… */
.sf-menu li {
position: relative;
}
/* …to this or even remove this style */
.sf-menu li {}