function set_1(){
                        document.getElementById('sub').value='1';

                        document.getElementById('mbg1').style.backgroundColor='#3D3D3D';
                        document.getElementById('mbg2').style.backgroundColor='#787878';
                        document.getElementById('mbg3').style.backgroundColor='#787878';
                        document.getElementById('mbg4').style.backgroundColor='#787878';
                        document.getElementById('mbg5').style.backgroundColor='#787878';

                        document.getElementById('additional3').style.display = 'none';
                        document.getElementById('additional2').style.display = 'none';
                        document.getElementById('additional').style.display = 'block';
                        
                        document.getElementById('pen1').className = 'pen';
                        document.getElementById('pen2').className = '';
                        document.getElementById('pen3').className = '';
                        document.getElementById('pen4').className = '';
                        document.getElementById('pen5').className = '';
                        
                        document.getElementById('arr1').className = 'arr';
                        document.getElementById('arr2').className = '';
                        document.getElementById('arr3').className = '';
                        document.getElementById('arr4').className = '';
                        document.getElementById('arr5').className = '';
                        return false;
                }
                function set_2(){
                        document.getElementById('sub').value='1';

                        document.getElementById('mbg2').style.backgroundColor='#3D3D3D';
                        document.getElementById('mbg1').style.backgroundColor='#787878';
                        document.getElementById('mbg3').style.backgroundColor='#787878';
                        document.getElementById('mbg4').style.backgroundColor='#787878';
                        document.getElementById('mbg5').style.backgroundColor='#787878';

                        document.getElementById('additional3').style.display = 'none';
                        document.getElementById('additional2').style.display = 'none';
                        document.getElementById('additional').style.display = 'block';
                        
                        document.getElementById('pen1').className = '';
                        document.getElementById('pen2').className = 'pen';
                        document.getElementById('pen3').className = '';
                        document.getElementById('pen4').className = '';
                        document.getElementById('pen5').className = '';
                        
                        document.getElementById('arr1').className = '';
                        document.getElementById('arr2').className = 'arr';
                        document.getElementById('arr3').className = '';
                        document.getElementById('arr4').className = '';
                        document.getElementById('arr5').className = '';
                        return false;
                }
                function set_3(){
                        document.getElementById('sub').value='1';

                        document.getElementById('mbg3').style.backgroundColor='#3D3D3D';
                        document.getElementById('mbg1').style.backgroundColor='#787878';
                        document.getElementById('mbg2').style.backgroundColor='#787878';
                        document.getElementById('mbg4').style.backgroundColor='#787878';
                        document.getElementById('mbg5').style.backgroundColor='#787878';

                        document.getElementById('additional3').style.display = 'none';
                        document.getElementById('additional2').style.display = 'none';
                        document.getElementById('additional').style.display = 'block';
                        
                        document.getElementById('pen1').className = '';
                        document.getElementById('pen2').className = '';
                        document.getElementById('pen3').className = 'pen';
                        document.getElementById('pen4').className = '';
                        document.getElementById('pen5').className = '';
                        
                        document.getElementById('arr1').className = '';
                        document.getElementById('arr2').className = '';
                        document.getElementById('arr3').className = 'arr';
                        document.getElementById('arr4').className = '';
                        document.getElementById('arr5').className = '';
                                return false;
                }
                function set_4(){
                        document.getElementById('sub').value='2';

                        document.getElementById('mbg4').style.backgroundColor='#3D3D3D';
                        document.getElementById('mbg1').style.backgroundColor='#787878';
                        document.getElementById('mbg2').style.backgroundColor='#787878';
                        document.getElementById('mbg3').style.backgroundColor='#787878';
                        document.getElementById('mbg5').style.backgroundColor='#787878';

                        document.getElementById('additional3').style.display = 'none';
                        document.getElementById('additional').style.display = 'none';
                        document.getElementById('additional2').style.display = 'block';
                        
                        document.getElementById('pen1').className = '';
                        document.getElementById('pen2').className = '';
                        document.getElementById('pen3').className = '';
                        document.getElementById('pen4').className = 'pen';
                        document.getElementById('pen5').className = '';
                        
                        document.getElementById('arr1').className = '';
                        document.getElementById('arr2').className = '';
                        document.getElementById('arr3').className = '';
                        document.getElementById('arr4').className = 'arr';
                        document.getElementById('arr5').className = '';
                        return false;
                }
                function set_5(){
                        document.getElementById('sub').value='3';

                        document.getElementById('mbg5').style.backgroundColor='#3D3D3D';
                        document.getElementById('mbg1').style.backgroundColor='#787878';
                        document.getElementById('mbg2').style.backgroundColor='#787878';
                        document.getElementById('mbg3').style.backgroundColor='#787878';
                        document.getElementById('mbg4').style.backgroundColor='#787878';

                        document.getElementById('additional').style.display = 'none';
                        document.getElementById('additional2').style.display = 'none';
                        document.getElementById('additional3').style.display = 'block';
                        
                        document.getElementById('pen1').className = '';
                        document.getElementById('pen2').className = '';
                        document.getElementById('pen3').className = '';
                        document.getElementById('pen4').className = '';
                        document.getElementById('pen5').className = 'pen';
                        
                        document.getElementById('arr1').className = '';
                        document.getElementById('arr2').className = '';
                        document.getElementById('arr3').className = '';
                        document.getElementById('arr4').className = '';
                        document.getElementById('arr5').className = 'arr';
                                return false;
                }