The menu above is a horizontal DHTMLMenu and it floats. Notice that it is also centered on the page hortizontally. Here is how to
center a floating horizontal menu:

1. Select the first menu item in the Menu Tree (the item just below <Top-level Menu>) and select Condition under
Menu Item Settings.

2. Enter the following code in the Prefix window:

_STNS._aStMenus[_STNS._aStMenus.length-1].iX="Math.max(stgcl()+parseInt(_STNS.fiGetCW()/2- STNS.fiGetEleWid(_STNS.fdmGetEleById(_STNS._aStMenus[_STNS._aStMenus.length-1].aPopups[0].sUid))/2),0)";

You could also center the menu vertically, although we're not sure why anyone would want to do that. To center the menu
vertically, enter the following code in the Prefix window:

_STNS._aStMenus[_STNS._aStMenus.length-1].iY="Math.max(stgct()+parseInt(_STNS.fiGetCH()/2- STNS.fiGetEleHei(_STNS.fdmGetEleById(_STNS._aStMenus[_STNS._aStMenus.length-1].aPopups[0].sUid))/2),0)";

We'll add some filler text to make sure the page can be scrolled.Consectetur adipisicing elit, ut aliquip ex ea commodo

consequat. Lorem ipsum dolor sit amet, in reprehenderit in voluptate excepteur sint occaecat. Eu fugiat nulla pariatur.

Consectetur adipisicing elit, duis aute irure dolor cupidatat non proident. Velit esse cillum dolore ut labore et dolore magna aliqua.

Quis nostrud exercitation sunt in culpa eu fugiat nulla pariatur. Consectetur adipisicing elit, velit esse cillum dolore qui officia deserunt.

Ut enim ad minim veniam, ut aliquip ex ea commodo consequat. Ullamco laboris nisi sed do eiusmod tempor incididunt ut labore et

dolore magna aliqua. In reprehenderit in voluptate sunt in culpa consectetur adipisicing elit. Velit esse cillum dolore eu fugiat nulla pariatur.
Mollit anim id est laborum.

Lorem ipsum dolor sit amet, quis nostrud exercitation sed do eiusmod tempor incididunt. Ut labore et dolore magna aliqua. Consectetur
adipisicing elit, duis aute irure dolor.

Ut aliquip ex ea commodo consequat. Ut labore et dolore magna aliqua. Ullamco laboris nisi quis nostrud exercitation sunt in culpa.
Lorem ipsum dolor sit amet, in reprehenderit in voluptate sed do eiusmod tempor incididunt. Velit esse cillum dolore eu fugiat nulla pariatur.