If decimal numbers contain a leading zero, it's always best to specify the radix as 10 so that you won't accidentally end up with an octal value. : Type Conversion « Number Data Type « JavaScript Tutorial

1. JavaScript Tutorial
2. Number Data Type
3. Type Conversion

var iNum1 = parseInt("010");        //returns 8
var iNum2 = parseInt("010", 8);     //returns 8
var iNum3 = parseInt("010", 10);    //returns 10