//You will need to include KeyboardFilterCommonCode on your page for this to work.
//<--
function PhoneNumberFilter (event)
    {   
        try
        {
            var rv ; 
            var keyAscii = GetKeyAscii (event) ;
           
            if (IsCommonAscii(keyAscii) ) 
                {rv= true;}
            else    
                {          
                    switch (keyAscii)
                        {   case 32:
                                rv=true ;
                            break; 
                            
                            case 48: case 49: case 50: case 51: case 52: case 53: case 54: case 55: case 56: case 57: 
                                // Numbers on keyboard
                                rv=true ;
                            break;
                            
                            case 96: case 97: case 98: case 99: case 100: case 101: case 102: case 103: case 104: case 105: 
                                // Numbers on numeric pad
                                rv=true ;
                            break;
                            
                            default:
                               //{alert(keyAscii);}
                                rv=false ;
                        }
                }
            return rv;    
        }
        catch (ex)
            { }
    }
//-->