The decimal point will be removed and the value will be fixed after the user press ENTER key or the inputing box loses focus. If you want to disable the decimal point absolutely, custom the 'filter' function to prevent from entering it.
$('#nb').numberbox({
precision: 0,
filter: function(e){
if (String.fromCharCode(e.which) == '.'){
return false;
} else {
return $.fn.numberbox.defaults.filter.call(this, e);
}
}
})