function UpdateDisplay(varLength, varWidth, varDepth, varUnits) {
var cTotal = (Math.round((((varLength*varWidth*(varDepth/12))/27)*varUnits)*100)/100);
if (varUnits == 1) {
	var cText = 'Yards';
	}
else {
	var cText = 'Tons';
	}
var cResult = cTotal+' '+cText;
document.Calc.Result.value = cResult;
}