**Attention** 
I cancel the work that I used "use:gradient" for at one time. 
After jquery.jqchart-0.02-beta-3.0.js, "use:gradient" is not usable. 
After v0.02-beta-3.0.js, I try the gradation in canvas.
0.02-beta-2.1.js.gradient(development).end() :)
<!-- libs -->
<script type="text/javascript" src="./lib/excanvas/excanvas-compressed.js"></script>
<![endif]-->
<script type="text/javascript" src="./lib/jquery-1.2.3.min.js"></script>
<script type="text/javascript" src="./jquery.jqchart-0.02-beta-2.1.js" charset="utf-8"></script>
<script type="text/javascript" src="./lib/jquery.dimensions.js"></script>
<script type="text/javascript" src="./jquery.gradient-forjqchart.js"></script>
</head><body>
<style>
body { 
	margin: 20px; 
	font-family: "Myriad Web","Trebuchet MS","Tahoma","Helvetica","Arial","sans-serif"; 
}
#myBgBox{
	background-color:#3f464c;
	padding:30px;
	padding-top:5px;
	text-align:center;
	color:white;
}
#myBgBox h5{
	margin :15px;
	font-size : 18px;
}
.jQchart{
	font-size : 12px;
}
.jQchart-bg{
	margin-left  : auto ;
	margin-right : auto ;
}
.jQchart-labelData{
	font-size : 9px;
}
.jQchart-title{
	font-size : 12px;
}
</style>
<script type="text/javascript">
var data = [
  	[234,555,234],
  	[300,700,600],
  	[789,666,887],
  	[456,890,226],
  	[336,666,776],
  	[458,788,888],
  	[123,333,567],
  	[786,221,777],
  	[666,567,789],
  	[895,654,888],
  	[333,222,444],
  	[456,123,789],
  	[543,235,999],
  	[444,666,227],
  	[123,234,222]
  ];
</script>
<div id="myBgBox">
	<h5>jQchart + use:gradient</h5>
	<canvas id="canvasMyID1" width="500" height="220"></canvas>
</div>
<script type="text/javascript">
var chartSetting1={
  config:{
    title    : '<b>type : "bar"</b>,setting.config.colorSet : $.jQchart.colorSets.rikyu',
    type     : 'bar',
    use      : 'gradient:#canvasMyID1',
    gradient : {
      direction : 'vertical',
      from  : '000000',
      to    : 'aabb00'
    },
    colorSet : $.jQchart.colorSets.rikyu
  },
  data : data
};
jQuery(function($){
	$('#canvasMyID1').jQchart(chartSetting1);
})
</script>