$(function () {
       $('.gloss_link').click(function () {
           var letter = $(this).attr('id');
           $('.gloss_link').removeClass('gloss_active');
           $(this).addClass('gloss_active');
           if (letter == "all") {
               $('.gloss_content').show();
               $('.backtotop').show();
           }
           else {
               $('.gloss_content').hide();
               $('.backtotop').hide();
               $('#' + letter + '_block').show();
           }
       });
       $('.see_also').click(function () {
           var allBlock = true;
           var blocks = $('.gloss_content');
           for (var i = 0; i < blocks.length; i++) {
               if ($(blocks[i]).css('display') == "none") {
                   allBlock = false;
               }
           }
           if (!allBlock) {
               var firstLetter = $(this).text().charAt(0).toLowerCase();
               var letters = $('.gloss_link');
               for (var j = 0; j < letters.length; j++) {
                   if ($(letters[j]).text().toLowerCase() == firstLetter) {
                       $('.gloss_content').hide();
                       $('#' + $(letters[j]).attr("id") + '_block').show();
                       $('.gloss_link').removeClass('gloss_active');
                       $('#gloss_' + firstLetter).addClass('gloss_active');
                   }
               }
           }
       });
   })