Changing the type of an input field using jQuery (text -> password)

I am trying to change type of input, specifically after click into input change type="text" to change="password".

I don't know why, but I can't to add the option type="password" as attribute to input.

        $('input#id_reg_pass').removeAttr("type"); #this works, type="text" is removing
        $('input#id_reg_pass').attr('type', 'password'); #problem, this not works
        $(this).addClass('exampleText').val($(this).attr('title'));

Haven't someone similar problem? I'll glad for every hint... Thank you