calculation help needed for google charting

I'm using google charts to create a chart based on data in the foundset. Using webviewer, I have a url such as:

http://chart.apis.google.com/chart?

cht=lc&chs=450x330&chd=t:7,18,11,26,22,11,14&

chxr=1,0,30&chds=0,30&

chco=4d89f9&

chxt=x,y&chxl=0:Mon|Tue|Wed|Thu|Fri|Sat|Sun&

chls=3,1,0&

chm=d,4d89f9,0,0,12,0|d,4d89f9,0,1,12,0|d,4d89f9,0,2,12,0|d,4d89f9,0,3,12,0|d,4d89f9,0,4,12,0|d,4d89f9,0,5,12,0|d,4d89f9,0,6,12,0&

chg=0,6.67,5,5

where I have substituted my data fields. the problem is the chart point markers chm=. I need to specify each marker counting up 0,1,2,3.... in the url above

chm=d,4d89f9,0,0,12,0|d,4d89f9,0,1,12,0|d,4d89f9,0,2,12,0

these are the the first 3 markers. as you can see the 4th character in each marker point goes up +1 for each data point. (wow this is hard to explain).

all the way up to my foundset count. sometimes I'll have 3 in my foundset, sometimes I'll have 20. How can I append a series of data to my url (based on the count of my foundset). I am thinking of how a loop works in a script where you have a variable = n, add 1, loop, exit loop if n=foundset count. How can I achieve that within a calculation (result is basically text...the url... which is then the webviewer).

thanks in advance!!!