Synced multiselect with jQuery multiselect and sheepit

syncedmulti.js

<script type="text/javascript">
Array.prototype.removeItem = function(val){
    var index = this.indexOf(val);
    if(index > -1) this.splice(index,1);
}
$(document).ready(function() {
    var selc = [];
    var sheepItForm = $('#sheepItForm').sheepIt({
        separator: '',
        allowRemoveLast: false,
        allowRemoveCurrent: true,
        allowRemoveAll: false,
        allowAdd: true,
        allowAddN: false,
        maxFormsCount: 10,
        minFormsCount: 1,
        iniFormsCount: 1,
        afterAdd: function(source, newfrm){
            var _f = $(newfrm),
                _sel = _f.find('select.sel')[0],
                _s = $(_sel);
            
            $.each(selc, function(i, e){
                _s.find('option[value="'+e+'"]')
                            .attr('disabled',true);
            });
            _s.multiselect({
                header: "select country",
                click: function(e, ui){
                    var _o = $('.sel').not(_s);
                    if(ui.value == 'any'){
                        if(ui.checked){
                            _s.children('option').each(function(index, opt){
                                //unselect selected elements
                                if($(opt).val() != 'any'){
                                    //if the option was selected 
                                    if($(opt).is(':selected')){
                                        selc.removeItem($(opt).val());
                                        
                                        //enable unselected element in other elements
                                        _o.children('option[value="'+$(opt).val()+'"]').attr('disabled',false);
                                    }
                                    
                                    $(opt).attr({'disabled':true, selected:false});
                                }
                            });
                        }else{
                            //enable available countries
                            _s.children('option').each(function(index, opt){
                                if(selc.indexOf($(opt).val()) == -1)
                                    $(opt).attr({'disabled':false});
                            });
                        }
                        _s.children('option[value="any"]').attr('selected',ui.checked);
                        _s.multiselect('refresh');
                    }
                    
                    _o.find('option[value="'+ui.value+'"]').attr('disabled',ui.checked);
                    (ui.checked) ? (selc.push(ui.value)) : (selc.removeItem(ui.value) );
                    //_s.multiselect('refresh');
                    _o.multiselect('refresh');
                }
            });
        },
        afterRemove: function(index, form){
            var _f = $(form),
                _sel = _f.find('select.sel')[0],
                _s = $(_sel),
                _o = $('.sel').not(_s);
                
            _s.children('option').each(function(index, opt){
                if($(opt).is(':selected')){
                    selc.removeItem($(opt).val());
                    
                    //enable unselected element in other elements
                    _o.children('option[value="'+$(opt).val()+'"]').attr('disabled',false);
                }
            });
            _o.multiselect('refresh');
        }
    });
 
});
</script>

Result

Array
(
    [countries] => Array
        (
            [0] => Array
                (
                    [0] => 2
                    [1] => 3
                )

            [1] => Array
                (
                    [0] => 4
                    [1] => 5
                )

            [2] => Array
                (
                    [0] => any
                )

            [3] => Array
                (
                    [0] => 1
                )

        )

)