Feet/Inches Calculation needing 2 decimal points

I have a formula that needs to calculate in Feet and Inches.  I have the formula working to calculate correctly, but now I need the inches to be only to 2 decimal points.  Please assist in how I get the inches to stop at 2 decimal points.  Thank you.

var PoleLenght = this.getField("PoleLenght").value;

if (PoleLenght>0)

{

var distanceInInches = (PoleLenght*0.162)+7.5;

event.value = convertInchesToFeet(distanceInInches);

}

else event.value = "";

function convertInchesToFeet(v)

{

var feet = Math.floor(v/12);

var inches = v%12;

return feet + "'-" + inches + "\"";

}