I also see that the root menue items are not centered properly.
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in fusion.css you can change that ...
/* Root Items */
.menutop {list-style: none;margin: 0;padding: 0;position: relative;line-height: 1.0;float: left;}
body #rt-menu ul.level1 {background:none;}
.menutop li.root {display: block;float: left;margin-left: -10px;}
.menutop li.root > .item {white-space: nowrap;display: block;float: left;font-weight: bold;padding: 0 24px;font-size: 12px;z-index: 100;cursor: pointer;position:relative;margin: 0 0 0 -10px;outline: none;text-transform: uppercase;text-align: center;line-height: 31px;}
.menutop li.root > .item span {display: block;margin: 0;outline: none;padding: 7px 0;}
.menutop li.root > .item em {font-size:11px;font-weight:normal;display:block;font-style:normal;text-transform: lowercase;}
change it to this should make it look better ...
(probably you have too look into the corresponding ie6.css as well)
/* Root Items */
.menutop {list-style: none;margin: 0;padding: 0;position: relative;line-height: 1.0;float: left;}
body #rt-menu ul.level1 {background:none;}
.menutop li.root {display: block;float: left;margin-left: 0px;}
.menutop li.root > .item {white-space: nowrap;display: block;float: left;font-weight: bold;padding: 0 15px;font-size: 12px;z-index: 100;cursor: pointer;position:relative;margin: 0 0 0 0px;outline: none;text-transform: uppercase;text-align: center;line-height: 31px;}
.menutop li.root > .item span {display: block;margin: 0;outline: none;padding: 7px 0;}
.menutop li.root > .item em {font-size:11px;font-weight:normal;display:block;font-style:normal;text-transform: lowercase;}
btw. I never liked the look of the "scroll to top-button" with the edges cut of ... so I would change that too ...