jQuery FLOT with Oracle Apex

<script id="source" language="javascript" type="text/javascript">
$(function () {
flotoptions = {
legend: {show: true, position: "nw"},
bars: {barWidth: 2250000000 },
points: {show:false },
lines: {show:false },
grid: { hoverable: true, clickable: true },
xaxis: { mode: "time",minTickSize: [1, "month"]}
};
flotplaceholder = $(".tabFlot");
 
//Click Handlers
$("#btn1").click(function(){eval("z.push(aa)");refreshPlot();return false;});
$("#btn2").click(function(){eval("z.push(bb)");refreshPlot();return false;});
$("#btn3").click(function(){eval("z.push(cc)");refreshPlot();return false;});
$("#btn4").click(function(){eval("z.push(dd)");refreshPlot();return false;});
$("#btn5").click(function(){eval("z.push(ee)");refreshPlot();return false;});
$("#btn6").click(function(){eval("z.push(ff)");refreshPlot();return false;});
 
function showTooltip(x, y, contents) {
$('&lt;div id="tooltip"&gt;' + contents + '&lt;/div&gt;').css( {
position: 'absolute',
display: 'none',
top: y + 5,
left: x + 5,
border: '1px solid #fdd',
padding: '2px',
'background-color': '#fee',
opacity: 0.80
}).appendTo("body").fadeIn(200);
}
$(".tabFlot").bind("plothover", function (event, pos, item) {
$("#x").text(pos.x.toFixed(2));
$("#y").text(pos.y.toFixed(2));
 
if (item) {
if (previousPoint != item.datapoint) {
previousPoint = item.datapoint;
 
$("#tooltip").remove();
var x = item.datapoint[0].toFixed(2),
y = item.datapoint[1].toFixed(2);
 
showTooltip(item.pageX, item.pageY,
"kg CO2 = " + y);
}
}
else {
$("#tooltip").remove();
previousPoint = null;
}
});
 
});
 
function refreshPlot(){
$.plot($(".tabFlot"), z, flotoptions);
};
 
</script>