adding fix when the user doesnt set the full precision of the number before trying to format it

Author: Diego Plentz

src/jquery.maskMoney.js

@@ -169,12 +169,12 @@
 
                     if(splitedNumbers.indexOf(".") > -1) {
                         // grab just the last part of the splited numbers
-                        decimalPart = splitedNumbers.slice(splitedNumbers.indexOf("."));
+                        decimalPart = splitedNumbers.slice(splitedNumbers.indexOf(".") + 1);
                         // grab just the right ammount of numbers that we need for the precision
                         decimalPart = decimalPart.slice(-settings.precision);
                     }
                     if (decimalPart.length < settings.precision) {
-                        leadingZeros = new Array(settings.precision+1).join(0);
+                        leadingZeros = new Array(settings.precision+1-decimalPart.length).join(0);
                         decimalPart += leadingZeros;
                         splitedNumbers += leadingZeros;
                     }

test/mask_test.js

@@ -22,6 +22,13 @@ test("with a pre-formatted number", function() {
     equal(input.val(), "123.45", "keeps the number precision");
 });
 
+test("with a pre-formatted number smaller then the set precision", function() {
+    var input = $("#input1").maskMoney();
+    input.val("123,4");
+    input.maskMoney("mask");
+    equal(input.val(), "123.40", "keeps the number precision");
+});
+
 test("with negative symbol and a field that doesn't allow negative ", function() {
     var input = $("#input1").maskMoney({allowNegative: false});
     input.val("-123");