I'm using this function to phone mask and works almost perfectly.

function mask(o, f) 

{ 

    v_obj = o; 

    v_fun = f; 

    setTimeout("execmask()", 1) 

};



function execmask() 

{ 

    v_obj.value = v_fun(v_obj.value) 

};



function mphone(v){

    v=v.replace(/D/g,"");           

    v=v.substring(0, 11);

    v=v.replace(/^(d{2})(d)/g,"(OXX$1) $2"); 

    v=v.replace(/(d)(d{4})$/,"$1-$2"); 

    return v;

}

Here I run the mask in the text field:

<input type="text" id="phone" name="phone" onkeypress="mask(this, mphone);" onblur="mask(this, mphone);" />

The problem is that I need to change this part of the code (OXX$1) to (0XX$1).

Current situation:

The correct formatting that I need:

The amount of 8 or 9 digits is the choice of the user.

Changing O to 0, causes an error in the mask.