Javascript Syntax: Return the greater of summed range or "0"

I am using Windows 7 and Adobe Acrobat X.
I have a field in which I want to show the sum of a range of fields. However, if that summed value is negative I want it to display a "0". I'm not sure of the syntax I need to use in order to get this result. I know how to do it in Excel, but not in Javascript. I found a thread for something somewhat similar but I think my issue lies in how I'm expressing the "sum" part of the formula. No matter what I do nothing seems to happen in the field. See below:
if (sum(this.getField("SecurityDeposit"),this.getField("Credit"),this.getField("OutstandingC harges"),this.getField("RepairCosts"),this.getField("OtherCosts"),this.getField("Interest" )).value > '0') {
event.value = sum(this.getField("SecurityDeposit"),this.getField("Credit"),this.getField("OutstandingCh arges"),this.getField("RepairCosts"),this.getField("OtherCosts"),this.getField("Interest") )
} else {
event.value = 0 // Default value here

Try changing the line:
if(fField.toString() != '') {
to:
if(fField.toString() != '' || fField.value == 0) {

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Javascript Syntax: Return the greater of summed range or "0"

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