jqplot change la couleur du graphique en survolant la souris

jqPlot de modifier la couleur de remplissage lorsque la souris survole... je veux supprimer cet effet.. Comment ??

Voici les options utilisées:

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 'exp'
shadow: true,       //show the trend line shadow.
lineWidth: 1.5,     //width of the trend line.
shadowAngle: 45,    //angle of the shadow.  Clockwise from x axis.
shadowOffset: 1.5,  //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
}
},
grid: {
drawGridLines: true,        //wether to draw lines across the grid or not.
gridLineColor: '#d0d0d0',    //*Color of the grid lines.
background: '#ffffff',      //CSS color spec for background color of grid.
borderColor: '#ffffff',     //CSS color spec for border around grid.
borderWidth: 2.0,           //pixel width of border around grid.
shadow: true,               //draw a shadow for grid.
shadowAngle: 45,            //angle of the shadow.  Clockwise from x axis.
shadowOffset: 1.5,          //offset from the line of the shadow.
shadowWidth: 3,             //width of the stroke for 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
renderer: $.jqplot.CanvasGridRenderer,  //renderer to use to draw the grid.
rendererOptions: {}         //options to pass to the renderer.  Note, the default
//CanvasGridRenderer takes no additional options.
},
axes: {
xaxis: {
renderer:$.jqplot.DateAxisRenderer,
rendererOptions:{tickRenderer:$.jqplot.CanvasAxisTickRenderer},
tickOptions:{
formatString:'%b %#d,%y'
}
},
yaxis: {      
labelRenderer: $.jqplot.CanvasAxisLabelRenderer,
borderColor:'#808080',
renderer: $.jqplot.LogAxisRenderer,
autoscale:true,
min:0,
tickOptions:{formatString:'$%.2f'}
}
},
highlighter: {
show:true,
sizeAdjust: 7.5
},
cursor:{zoom:true, showTooltip:true},
legend:{show:false}
};

source d'informationauteur Shrinath