Oh, si es posible, algo asi con css:
<ul class="menu">
<li>Foro</li>
<li>Portal</li>
<li>Soporte</li>
<ul>
global.css:
ul.menu {
margin:0px;
padding:0px;
width:100%;
}
ul.menu li {
display:inline;
margin:0px 3px;
padding:5px;
border:1px solid #3d83f1;
background: #6db3f2;
background: -moz-linear-gradient(top, #6db3f2 0%, #54a3ee 50%, #3690f0 51%, #1e69de 100%);
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#6db3f2), color-stop(50%,#54a3ee), color-stop(51%,#3690f0), color-stop(100%,#1e69de));
background: -webkit-linear-gradient(top, #6db3f2 0%,#54a3ee 50%,#3690f0 51%,#1e69de 100%);
background: -o-linear-gradient(top, #6db3f2 0%,#54a3ee 50%,#3690f0 51%,#1e69de 100%);
background: -ms-linear-gradient(top, #6db3f2 0%,#54a3ee 50%,#3690f0 51%,#1e69de 100%);
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#6db3f2', endColorstr='#1e69de',GradientType=0 );
background: linear-gradient(top, #6db3f2 0%,#54a3ee 50%,#3690f0 51%,#1e69de 100%);
}
Quizas olvide algo, pero esa es la idea ^^U