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Kevin Lucas wrote: > I have edited the loop but still get only the literal string "sum += > parseInt( document.splitfm.vat_low3.value " as an input to the box > low_vattot > what do I need to convert this to the .value? Ahh.. penny has dropped... I think. Steven may correct me if I'm wrong on this but IIRC Javascript evaluates symbols thus: == (double =) means 'this is the content of' = means 'this is the result of' Not sure if that makes linguistic sense so here's an example: a = 2 + 4 result - a = 6 a== 2+4 result - a is a string '2+4' In other words I think you may have a == where you want a =, or vice versa. Also, it may be the single quotes around the expression telling the script to enclose the lot in a string; vat_low = 'sum += parseInt( document.splitfm.vat_low' + i + '.value )'; Try: vat_low = sum += parseInt( document.splitfm.vat_low' + i + '.value ); I notice as well that vat_low isn't given an initial value, so the script may assume it's a string and not be calculating the value as a mathematical value, but concatenating it as a string. Kind regards, Julian -- The Mailing List for the Devon & Cornwall LUG http://mailman.dclug.org.uk/listinfo/list FAQ: http://www.dcglug.org.uk/linux_adm/list-faq.html