CPF e CNPJ no mesmo campo

[tiagocaus 1]

O que esta errado nesse código?

 

http://jsfiddle.net/ujrvLnax/

CPF/CMPJ: </label><input type="text" id="cpf_cnpj" />

jQuery(document).ready(function() {
    jQuery('#cpf_cnpj').mask("99.999.999/9999-99").ready(function(event) {
        var target, cpf_cnpj, element;
        target = (event.currentTarget) ? event.currentTarget : event.srcElement;
        cpf_cnpj = target.value.replace(/\D/g, '');
        element = $(target);
        element.unmask();
        if(cpf_cnpj.length > 11) {
            element.mask("99.999.999/9999-99");
        } else {
            element.mask("999.999.999-99");
        }
    });
});

[Snowden 94]

http://jsfiddle.net/ujrvLnax/2/

[tiagocaus 1]

Muito obrigado!