Custom Format for percentage, how do i remove decimals?

Hi all, long time reader, first time poster.

Thanks very much for all the help and info I've already managed to gather from here.

So onto my question:

I've used a custom format as a work around to the divide by zero errors. It works perfectly, but sometimes it will show 33% or 33.333% or even sometimes 33.3333% (33 just an example).

What can I add to my script to make it so it has no decimals? Or worst case scenario, only 1 or 2 decimal places?

Also, just thought of a side question, is it possible to have it show blank rather than NaN?

The custom format script I've used is:

var numerator = + getField ( " RMTimely " ) . value ;

var denominator = + getField ( " RMTotal " ) . value;

if ( denominator ! = = 0 ) {
event . value = numerator / denominator ;

} else {
event.value = " " ;

}

Any help or guidance you can give me on this is much appreciated.

Thanks in advance.

Kyle