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Simple encode problem in Google Charts through Apex:image Url attribute



I'm trying to develop a Bar Chart on google chart using simple encoding format .. 
I have tried this to my URL attribute in <apex:image>


<apex:pageBlock >
        <apex:image title="Transfer Details" alt="Salary for Employees" url=",30000,40000,50000,60000),70000),simpleEncode(Array(3,4,5,6,7),10)&chxt=x,x,y,y,r,r&chxr=4,0,10,2&chxl=0:|{!name}|1:|Transferee+Name|3:|Salary|5:|Job+Level&chf=b0,lg,0,FFE7C6,0,76A4FB,1|bg,s,000000&chs=800x300&chbh=15,5,15" />

I have defined the essential Javascript function for simpleEncode as given in google chart parameters

     <script type="text/javascript">
     var simpleEncoding = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
     // This function scales the submitted values so that
     // maxVal becomes the highest value.
     function simpleEncode(valueArray,maxValue) {
         var chartData = ['s:'];
         for (var i = 0; i < valueArray.length; i++) {
             var currentValue = valueArray[i];
             if (!isNaN(currentValue) && currentValue >= 0) {
                 chartData.push(simpleEncoding.charAt(Math.round((simpleEncoding.length-1) *currentValue / maxValue)));
             else {
         return chartData.join('');

I have added this function directly into chd:s element 


var valueArray = new Array(0,1,4,4,6,11,14,17,23,28,33,36,43,59,65);
var maxValue = 70;
simpleEncode(valueArray, maxValue);



P.S please ignore the chxl part


I'm new to this and i have no idea about this

Any help would be appreciated


Thanks in Advance