Conditional Local RasterFunction via Rest API (Javascript)

[GeorgeRaber]

I am trying to create a raster function chain through the rest API (Image Service).  I can't seem to get the syntax right for a conditional operation.  This is what I have but it is causing me errors:

						rft = new RasterFunction();
						rft.functionName = "Local";
						rft.functionArguments = {
						"Operation" : 76,
						"Rasters" : [rfc, rf1h, rf1l]
						};
						rft.variableName = "riskOutput";
						rft.outputPixelType = "U16";

How do I paramaterize the conditional, true, false values correctly.  I can't find examples anywhere.

Thanks