jqplot changes the color of graph on mouse hover

jqPlot changes the color of the fill when mouse hovers... I want to remove that effect.. How ??

Here are the options used:

var options={
    series: [{
            neighborThreshold: -1,
            shadowAngle:0,
            shadowOffset:2.5,
            shadowAlpha:.05,
            shadowDepth:5
        }],
    seriesDefaults: {
        color: '#224',
        fill: true,        // fill under the line,
        fillAndStroke: true,       // *stroke a line at top of fill area.
        fillColor: '#66CCCC',       // *custom fill color for filled lines (default is line color).
        fillAlpha: 0.2,       // *custom alpha to apply to fillColor.
        markerRenderer: $.jqplot.MarkerRenderer,    // renderer to use to draw the data
        // point markers.
        markerOptions: {
            show: false,             // wether to show data point markers.
            style: 'filledCircle',  // circle, diamond, square, filledCircle.
            // filledDiamond or filledSquare.
            lineWidth: 2,       // width of the stroke drawing the marker.
            size: 9,            // size (diameter, edge length, etc.) of the marker.
            color: '#FFFF00',    // color of marker, set to color of line by default.
            shadow: true,       // wether to draw shadow on marker or not.
            shadowAngle: 45,    // angle of the shadow.  Clockwise from x axis.
            shadowOffset: 1,    // offset from the line of the shadow,
            shadowDepth: 3,     // Number of strokes to make when drawing shadow.  Each stroke
            // offset by shadowOffset from the last.
            shadowAlpha: 0.07   // Opacity of the shadow
        },
        trendline: {
            show: false,         // show the trend line
            color: '#666666',   // CSS color spec for the trend line.
            label: '',          // label for the trend line.
            type: 'linear',     // 'linear', 'exponential' or 'ex