document.write( '<style type="text/css">#check1{ display: none; }</style>' );
      document.write( '<style type="text/css">#check2{ display: none; }</style>' );
      document.write( '<style type="text/css">#check3{ display: none; }</style>' );
      document.write( '<style type="text/css">#check4{ display: none; }</style>' );
      document.write( '<style type="text/css">#check5{ display: none; }</style>' );
      document.write( '<style type="text/css">#check6{ display: none; }</style>' );
      document.write( '<style type="text/css">#check7{ display: none; }</style>' );
      
      function checkHandler1()
      {
        var check1 = document.getElementById( 'check1' );
        check1.checked = !( check1.checked );
        synchronise1(); 
      }
      
      function synchronise1()
      {
        var check1 = document.getElementById( 'check1' );
        var fakeCheck1 = document.getElementById( 'fakeCheck1' );
        check1.checked ? fakeCheck1.src = 'chk_on.gif' : fakeCheck1.src = 'chk_off.gif';
      }
    
      function checkHandler2()
      {
        var check2 = document.getElementById( 'check2' );
        check2.checked = !( check2.checked );
        synchronise2(); 
      }
      
      function synchronise2()
      {
        var check2 = document.getElementById( 'check2' );
        var fakeCheck2 = document.getElementById( 'fakeCheck2' );
        check2.checked ? fakeCheck2.src = 'chk_on.gif' : fakeCheck2.src = 'chk_off.gif';
      }

      function checkHandler3()
      {
        var check3 = document.getElementById( 'check3' );
        check3.checked = !( check3.checked );
        synchronise3(); 
      }
      
      function synchronise3()
      {
        var check3 = document.getElementById( 'check3' );
        var fakeCheck3 = document.getElementById( 'fakeCheck3' );
        check3.checked ? fakeCheck3.src = 'chk_on.gif' : fakeCheck3.src = 'chk_off.gif';
      }
      
      function checkHandler4()
      {
        var check4 = document.getElementById( 'check4' );
        check4.checked = !( check4.checked );
        synchronise4(); 
      }
      
      function synchronise4()
      {
        var check4 = document.getElementById( 'check4' );
        var fakeCheck4 = document.getElementById( 'fakeCheck4' );
        check4.checked ? fakeCheck4.src = 'chk_on.gif' : fakeCheck4.src = 'chk_off.gif';
      }

      function checkHandler5()
      {
        var check5 = document.getElementById( 'check5' );
        check5.checked = !( check5.checked );
        synchronise5(); 
      }
      
      function synchronise5()
      {
        var check5 = document.getElementById( 'check5' );
        var fakeCheck5 = document.getElementById( 'fakeCheck5' );
        check5.checked ? fakeCheck5.src = 'chk_on.gif' : fakeCheck5.src = 'chk_off.gif';
      }

      function checkHandler6()
      {
        var check6 = document.getElementById( 'check6' );
        check6.checked = !( check6.checked );
        synchronise6(); 
      }
      
      function synchronise6()
      {
        var check6 = document.getElementById( 'check6' );
        var fakeCheck6 = document.getElementById( 'fakeCheck6' );
        check6.checked ? fakeCheck6.src = 'chk_on.gif' : fakeCheck6.src = 'chk_off.gif';
      }

      function checkHandler7()
      {
        var check7 = document.getElementById( 'check7' );
        check7.checked = !( check7.checked );
        synchronise7(); 
      }
      
      function synchronise7()
      {
        var check7 = document.getElementById( 'check7' );
        var fakeCheck7 = document.getElementById( 'fakeCheck7' );
        check7.checked ? fakeCheck7.src = 'chk_on.gif' : fakeCheck7.src = 'chk_off.gif';
      }