Algorithm: Convert number to word

NumberToWords= function(number)
			{
				
			    if (number == 0)
			        return "zero";

			    if (number < 0)
			        return "minus " + $scope.NumberToWords(Math.abs(number));

			    var words = "";

			    if (Math.floor(number / 1000000) > 0)
			    {
			        words += $scope.NumberToWords(Math.floor(number / 1000000)) + " million ";
			        number %= 1000000;
			    }

			    if (Math.floor(number / 1000) > 0)
			    {
			        words += $scope.NumberToWords(Math.floor(number / 1000)) + " thousand ";
			        number %= 1000;
			    }

			    if (Math.floor(number / 100) > 0)
			    {
			        words += $scope.NumberToWords(Math.floor(number / 100)) + " hundred ";
			        number %= 100;
			    }

			    if (number > 0)
			    {
			        if (words != "")
			            words += "and ";

			        var unitsMap = [ "zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine", "ten", "eleven", "twelve", "thirteen", "fourteen", "fifteen", "sixteen", "seventeen", "eighteen", "nineteen" ];
			        var tensMap = ["zero", "ten", "twenty", "thirty", "forty", "fifty", "sixty", "seventy", "eighty", "ninety" ];

			        if (number < 20)
			            words += unitsMap[number];
			        else
			        {
			            words += tensMap[Math.floor(number / 10)];
			            if ((number % 10) > 0)
			                words += "-" + unitsMap[number % 10];
			        }
			    }

				
				
			    return words;
			}