ok, so let's cover some bases.
a) the items in a chrome menu are assigned a css class. The name of the class is on the menu settings, Css Class tab, Chrome Tab, and defaults to 'chromesep'
b) The chromesep class is declared in chromemenu.css as
.chromesep {
background:#D0D0D0 none repeat scroll 0 0;
color:#404090;
padding:4px;
width:100%;
}
c) you're using an image as a separator.
So let's put all this together. Firstly since your separator is a single line anyway, we can do that with CSS alone, and dispense with the image altogether.
Secondly, you can specify your own css for this item.
Create a css file, and add something like
.chromesep2 {
background:#D0FFD0 none repeat scroll 0 0;
width:100%;
height: 3px;
}
you can obviously change the height and color to whatever you prefer.
Add your css to the list using the Styles tab in the Web Server procedure.
Incidentally this technique should work in NT4 and NT5
Cheers
Bruce