td {
background: -webkit-gradient(linear, left top, left 38, from(#163866), to(#8bc9f3));
background: -moz-linear-gradient(top, #163866, #8bc9f3 38px);
FILTER: progid:DXImageTransform.Microsoft.Gradient(gradientType=1,startColorStr=#163866,endColorStr=#8bc9f3)
height: 38px;
}
This will work in FF 3.6+, Safari 4+, Chrome, and IE 6+ (I think that supports gradient filters). Each browser will ignore the declarations it doesn't understand, so having all 3 will support all major browsers. Opera doesn't yet support gradients, instead use SVG (Scalable Vector Graphics)
Firefox Gradient documentation
Webkit (Safari/Chrome) Gradient documentation
Opera Gradients