function Round2Nearest(n) {
        //
        var floatnumber = Number(n);
        var Rounded = Math.round(floatnumber);
        var NextInt = Math.ceil(floatnumber);
        var PrevInt = Math.floor(floatnumber);
        //
        if ( (Math.abs(floatnumber)+ 0.5) != NextInt) {
                //
                trace(floatnumber add " >NextInt:" add NextInt);
                trace(floatnumber add " >PrevInt: " add PrevInt);
                var diff2next = (NextInt-floatnumber);
                var diff2prev = (floatnumber-PrevInt);
                trace("al prossimo intero mancano: " add diff2next);
                trace("all'intero precedente mancano: " add diff2next);
                //
                var Major = Math.max(diff2prev, diff2next);
                var IsPos = (floatnumber>0);
                //
                if (Major == diff2prev) {
                        trace("floatnumber è da chiudere all'intero precedente");
                        return IsPos ? PrevInt : NextInt;
                }
                else {
                        trace("floatnumber è da chiudere all'intero successivo");
                        return IsPos ? NextInt : PrevInt;
                }
                //
        }
        else {
                trace("case: 0,5 but non 0,5 periodico... ("add floatnumber add")");
                return floatnumber;
        }
}
//
//
//
//
//
//Usage:
trace(Round2Nearest(0.000001));
trace(Round2Nearest(10.89));
trace(Round2Nearest(0.09));
trace(Round2Nearest(0.5));
trace(Round2Nearest(0.555555));
trace(Round2Nearest(0.5555551));
//
this.onEnterFrame = function() {
        trace(Round2Nearest(Math.random()));
};
stop;

function addCommas(theNumber){
	numString = theNumber + ""; //convert # to string
	newString = ""; //return string
	index = 1; // string index
	trip = 0; // trip, as in triple.
	while(numString.length >= index){
  	   if (trip!=3){ //haven't reached 3 chars yet
	      newString = numString.charAt(numString.length - index) + newString; //add char	
	      index++;
	      trip++;
	   }
	   else{ //reached 3 chars, add comma
	      newString = "," + newString;
	      trip=0;
	   }
	}
	return (newString);
}

/**
* Formats the given Number with commas
*/
public static function formatNumberWithCommas(num) {
        var strNum:String = num+"";
        if (strNum.length < 4)
        return strNum;
        return formatNumberWithCommas(strNum.slice(0, -3))+","+strNum.slice(-3);
}

//This one could be handy to format values to a currency format.

Math.__proto__.toMoney = function (num){
        valor = String (Math.round(num * 100) / 100);
        dot = valor.indexOf(".");
        money = "$";
        if(dot == -1){
                valor += ".0";
        }
        temp = valor.split(".");
        addDecimals = 2 - temp[1].length;
        for(i=1; i<= addDecimals; i++){
                valor += "0";
        }
        return money+valor;
};
a = 0.5;
b = 0.8;
trace(z = Math.moneyFormat(5));//if you trace thism, z will display "$5.00"
trace(z = Math.moneyFormat(a + b));//if you trace thism, z will display "$1.30"

//format a number into specified number of decimal places
Math.formatDecimals = function (num, digits) {
        //if no decimal places needed, we're done
        if (digits <= 0) {
                return Math.round(num);
        }
        //round the number to specified decimal places
        //e.g. 12.3456 to 3 digits (12.346) -> mult. by 1000, round, div. by 1000
        var tenToPower = Math.pow(10, digits);
        var cropped = String(Math.round(num * tenToPower) / tenToPower);
        //add decimal point if missing
        if (cropped.indexOf(".") == -1) {
                cropped += ".0"; //e.g. 5 -> 5.0 (at least one zero is needed)
        }
        
        //finally, force correct number of zeroes; add some if necessary
        var halves = cropped.split("."); //grab numbers to the right of the decimal
        //compare digits in right half of string to digits wanted
        var zerosNeeded = digits - halves[1].length; //number of zeros to add
        for (var i=1; i <= zerosNeeded; i++) {
                cropped += "0";
        }
        return(cropped);
} //Robert Penner May 2001 - source@robertpenner.com