$().cssGradient

gistfile1.js

$.fn.cssGradient = function(start, end) {
  end = end || start;
  if (!start) { return this; }

  return this.css({
    "background-image": "-moz-linear-gradient(100% 100% 90deg, " + end + ", " + start + ")",
    "background-image": "-webkit-gradient(linear, 0% 0%, 0% 100%, from(" + start + "), to(" + end + "))",
    "-ms-filter": "progid:DXImageTransform.Microsoft.gradient(GradientType=0, startColorstr=" + start + ", endColorstr=" + end + ")"
  });
};