//*** This code is copyright 2003 by Gavin Kistner, gavin@refinery.com
//*** It is covered under the license viewable at http://phrogz.net/JS/_ReuseLicense.txt
//*** Reuse or modification is free provided you abide by the terms of that license.
//*** (Including the first two lines above in your source code satisfies the conditions.)


// See also http://phrogz.net/JS/Number.prototype.format.js.txt


// Rounds a number to a specific number of decimal places
// Supports 'negative' decimals, e.g.
//    myNumber.roundToDecimals(-3)
// will round to the nearest thousand

// !!!!!!! Does not work properly on numbers -1<x<0

Number.prototype.roundTo = function(decimals){
	var n=this.valueOf();
	if (!decimals) decimals=0;
	if (n==0) return "0."+((Math.pow(10,decimals)+"").substr(1));
	n=Math.round(n*Math.pow(10,decimals))+"";
	var breakPoint=n.length-decimals;
	return (n.substr(0,breakPoint)+(decimals>0?"."+n.substr(breakPoint):(Math.pow(10,-decimals)+"").substr(1))).replace(/^0+/,'0');
}

// var x = 1234.3567
// x.roundTo(2);
//  --> 1234.36
// x.roundTo(-3);
//  --> 1000


//If you don't care about negative decimals,
//AND you can guarantee that the result will not be less than 0.1
//the following version is about 15% faster:
Number.prototype.roundTo=function(decimals){
	var s=Math.round(this.valueOf()*Math.pow(10,decimals))+'';
	var chopPoint = s.length-decimals;
	return s.substr(0,chopPoint)+'.'+s.substr(chopPoint);
}