parameter with dots in the name

I have following Javascript function:

function onRGLink(rGCode) {
frmRG.com.abc.xyz.rGCode.value = rGCode;
frmRG.submit();
}

I do not know how to delimit parameter com.abc.xyz.rGCode inside the
statement
frmRG.com.abc.xyz.rGCode.value = rGCode;

I tried both frmRG.’com.abc.xyz.rGCode’.value = rGCode;

and frmRG.”com.abc.xyz.rGCode”.value = rGCode;

but no success. I have to have dots in this parameter name.

many thanks,
Mile

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