function perRound(num, precision) {
	var precision = 2; //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=''
	}
}

// convert from grams to other units

function nofocus()
{
	document.convert.InUnit.focus()
}

var gValue = 1;
var kgValue = 1000;
var ounceValue = 28.3495;
var lbValue = 453.592;
var tValue = 907184;

function toCM()
{
	var i = document.convert.unit.selectedIndex;
	var thisUnit = document.convert.unit.options[i].value;
	if (thisUnit == "G")
	{
		document.convert.g.value = document.convert.InUnit.value;
	}
	else if(thisUnit == "KG")
	{
		document.convert.g.value = document.convert.InUnit.value * kgValue;
	}
	else if(thisUnit == "OUNCE" )
	{
		document.convert.g.value = document.convert.InUnit.value * ounceValue;
	}
	else if(thisUnit == "LB" )
	{
		document.convert.g.value = document.convert.InUnit.value * lbValue;
	}
	toAll();
}
function toAll()
{
	var m = document.convert.g.value;
	document.convert.kg.value = m / kgValue;
	document.convert.ounce.value = m / ounceValue;
	document.convert.lb.value = m / lbValue;
}