[javascript] underber to camel, camel to underbar

function underToCamel(str){

return str.toLowerCase().replace(/(\_[a-z])/g, function(arg){

return arg.toUpperCase().replace('_','');

});

}

function camelToUnderber(str){

return str.replace(/([A-Z])/g, function(arg){

return "_"+arg.toLowerCase();

}).toUpperCase();

}