function readOnly(count){ }
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Looks like it has been defined to display ONMOUSEOVER javascript function,
Try this ,
<!-- Page: -->
<apex:chart data="{!pieData}" height="300" width="400">
<apex:pieSeries labelField="name" dataField="data1"/>
</apex:chart>
donut Integer An integer representing the radius of the hole to place in the center of the pie chart, as a percentage of the radius of the pie. If no value is specified, 0 is used, which creates a normal pie chart, with no hole.
http://www.salesforce.com/us/developer/docs/pages/Content/pages_compref_pieSeries.htm
<apex:chart data="{!pieData}" height="400" width="500" background="#F5F5F5">
<apex:legend position="left"/>
<apex:pieSeries labelField="name" dataField="data1" donut="50">
<apex:chartLabel display="middle" orientation="vertical"
font="bold 18px Helvetica"/>
</apex:pieSeries>
</apex:chart>
http://www.salesforce.com/us/developer/docs/pages/Content/pages_charting_appearance_pie_charts.htm
Regards,
Ashish