function perRound(num, precision) {
	var precision = 3; //default value if not passed from caller, change if desired
	// remark if passed from caller
	precision = parseInt(precision); // make certain the decimal precision is an integer
    var result1 = num * Math.pow(10, precision);
    var result2 = Math.round(result1);
    var result3 = result2 / Math.pow(10, precision);
    return zerosPad(result3, precision);
}

function zerosPad(rndVal, decPlaces) {
    var valStrg = rndVal.toString(); // Convert the number to a string
    var decLoc = valStrg.indexOf("."); // Locate the decimal point
    // check for a decimal 
    if (decLoc == -1) {
        decPartLen = 0; // If no decimal, then all decimal places will be padded with 0s
        // If decPlaces is greater than zero, add a decimal point
        valStrg += decPlaces > 0 ? "." : "";
    }
    else {
        decPartLen = valStrg.length - decLoc - 1; // If there is a decimal already, only the needed decimal places will be padded with 0s
    }
     var totalPad = decPlaces - decPartLen;    // Calculate the number of decimal places that need to be padded with 0s
    if (totalPad > 0) {
        // Pad the string with 0s
        for (var cntrVal = 1; cntrVal <= totalPad; cntrVal++) 
            valStrg += "0";
        }
    return valStrg;
}
// send the value in as "num" in a variable

// clears field of default value
function clear_field(field) {
		if (field.value==field.defaultValue) {
			field.value=''
		}
	}

// calculate alcohol

function solvebal(form) {
var message;
var alcozs = eval(form.alcozs.value); //consumed ounces
var alcpct = eval(form.alcpct.value); //alcohol percent
var bodywt = eval(form.bodywt.value); //body weight
var tsca = eval(form.tsca.value); //time since starting to consume ANY alcohol
alcozs=alcozs*33.814022702;
bodywt=bodywt*2.2046226218;

var result = (alcozs * alcpct * 0.075 / bodywt) - (tsca * 0.015);
if (result < 0) {
message = "There is a negligible amount of alcohol in your system.  You are not legally intoxicated.";
result = "-- neglible amount --";
}
else {
if (result == "NaN")
message = "Incorrect Values. Please try again."; 
if (result > 0.08) 
message = "In MOST and probably ALL states you would be considered intoxicated and arrested for DUI or DWI.";
if (result < 0.08)
message = "You are not legally intoxicated";
}
form.message.value = message;
form.balamount.value = result + " %";
}