this does actually make alot of sense peter. Can i just ask about the following 
lines of code:

> document.getElementById('mychart').src= '/generate_chart.cfm/chart.
> jpg?params='+v;

i understand the v is the variable of the select option that was just changed 
but why is the chart.jpeg? added
is it because the cfchart tag in the generate_chart.cfm page will generate a 
jpeg called chart.jpeg and therefore we are now equalling the source to that 
outputted jpeg?

thanks again peter

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