I suggest that you should images and set the HoveredImageUrl
property of the RadMenu item.
If you work with css only ( without using images) you need to write hacks for all browsers. IE supports only two color gradient and you should use filters.
/* different browser */
/* FF browser from 3.6 */
background: -moz-linear-gradient(#3d474b, #263135);
/* Safari and Chrome browser */
background: -webkit-gradient(linear, left top, left bottom, from(#3d474b), to(#263135));
/* IE browser */
, startColorstr=#3d474b, endColorstr=#263135);
All the best,
the Telerik team
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