ÿþ   var myurlstr = String(window.location);



   var side_menu_education_status = 1;

   var side_menu_knowledge_status = 1;

   var side_menu_freetime_status = 1;

   var side_menu_fun_status = 1;



   function open_db_item(item_name) {

      parent.location = 'db/' + item_name + '/' + item_name + '.shtml';

   }



   function open_topic(topic_name) {

      parent.location = '/topics/' + topic_name + '/' + topic_name + '.shtml';

   }



   function open_topic_subject(topic_subject) {

      var topic_subject_str = String(topic_subject);

      var topic_name = topic_subject_str.substring(0,topic_subject_str.indexOf("|"));

      var subject_name = topic_subject_str.substring(topic_subject_str.indexOf("|") + 1,topic_subject_str.length);

      parent.location = '/topics/' + topic_name + '/' + subject_name + '.shtml';

   }



   function open_chapter(item, year) {

      parent.location = 'db/' + item + '/' + item + '.shtml?item=' + item + '&year=' + year;

      document.getElementById("owl_board_text").innerHTML=year;

   }



   function open_tiy(topic, item, year) {

      parent.location = '/topics/' + topic + '/db/' + item + '/' + item + '.shtml?item=' + item + '&year=' + year;

      document.getElementById("owl_board_text").innerHTML=year;

   }



   function open_file(file_name) {

      parent.location = '/' + file_name;

   }



   function open_local_shtml_file(file_name) {

      parent.location = file_name + '.shtml';

   }





   function open_topic_year_item(item) {



      var myurlstr = String(item);



      var topicstr = myurlstr.substring(0,myurlstr.indexOf("|"));

      var yearstr = myurlstr.substring(myurlstr.indexOf("|") +1 ,myurlstr.indexOf(" "));

      var itemstr = myurlstr.substring(myurlstr.indexOf(" ") + 1,myurlstr.length);



      var topic = topicstr.substring(topicstr.indexOf("") ,topicstr.length)

      var year = yearstr.substring(yearstr.indexOf(""),yearstr.length);

      var item = itemstr.substring(itemstr.indexOf(""),itemstr.length)



      if (!(topic == "seperator")) {

         parent.location = "/topics/" + topic + "/db/" + item + "/" + item + ".shtml?item=" + item + "&year=" + year;

      var t_time0;

      t_time0=setTimeout("document.getElementById('owl_board_text').innerHTML=year", 500);

      }

   }



   function open_topic_item_chapter(item) {



      var myurlstr = String(item);



      var topicstr = myurlstr.substring(0,myurlstr.indexOf("|"));

      var itemstr = myurlstr.substring(myurlstr.indexOf("|") +1 ,myurlstr.indexOf(" "));

      var chapterstr = myurlstr.substring(myurlstr.indexOf(" ") + 1,myurlstr.length);



      var topic = topicstr.substring(topicstr.indexOf("") ,topicstr.length)

      var item = itemstr.substring(itemstr.indexOf(""),itemstr.length);

      var chapter = chapterstr.substring(chapterstr.indexOf(""),chapterstr.length)



      parent.location = "/topics/" + topic + "/db/" + item + "/" + item + ".shtml?item=" + item + "#" + chapter;

   }



   function open_topic_item_file_chapter(item) {



      var myurlstr = String(item);



      var topicstr = myurlstr.substring(0,myurlstr.indexOf("|"));

      var itemstr = myurlstr.substring(myurlstr.indexOf("|") +1 ,myurlstr.indexOf(" "));

      var filestr = myurlstr.substring(myurlstr.indexOf(" ") + 1,myurlstr.indexOf("#"));

      var chapterstr = myurlstr.substring(myurlstr.indexOf("#") + 1,myurlstr.length);



      var topic = topicstr.substring(topicstr.indexOf("") ,topicstr.length)

      var item = itemstr.substring(itemstr.indexOf(""),itemstr.length);

      var file = filestr.substring(filestr.indexOf(""),filestr.length);

      var chapter = chapterstr.substring(chapterstr.indexOf(""),chapterstr.length)



      parent.location = "/topics/" + topic + "/db/" + item + "/" + file + ".shtml#" + chapter;

   }





   function open_topic_item(item) {



      var myurlstr = String(item);



      var topicstr = myurlstr.substring(0,myurlstr.indexOf("|"));

      var itemstr = myurlstr.substring(myurlstr.indexOf("|") +1 ,myurlstr.indexOf(" "));

      var chapterstr = myurlstr.substring(myurlstr.indexOf(" ") + 1,myurlstr.length);



      var topic = topicstr.substring(topicstr.indexOf("") ,topicstr.length)

      var item = itemstr.substring(itemstr.indexOf(""),itemstr.length);

      var chapter = chapterstr.substring(chapterstr.indexOf(""),chapterstr.length)



      parent.location = "/topics/" + topic + "/db/" + item + "/" + item + ".shtml";

   }



   function f_check_exam(num_questions, num_answers) {

      var oForm = document.forms["exam"];

      var oAnswer;

      var answer_selected, answer_value;

      var grade = 0;

      var i;



      for (i=0; i<num_answers; i=i+1) {

         oAnswer = oForm.elements[i];

         answer_selected = oAnswer.checked;

         answer_value = oAnswer.value;

         if ((answer_selected) && (answer_value == "1")) {

            grade = grade + 1;

         }

      }

      document.getElementById("exam_result").innerHTML = "âàÙê àÛÕß âÜ " + grade + " éÐÜÕê";

      for (i=1; i<=num_questions; i=i+1) {

         document.getElementById("a"+i).style.backgroundColor = "#8F2";

      }

   }



   function f_check_exe(exe_name, num_q) {

      var oForm = document.forms[exe_name];

      var oAnswer;

      var answer_selected, answer_value;

      var corrects = 0;

      var grade = 0;

      var i;



      for (i=1; i<=num_q; i=i+1) {

         oAnswer = oForm.elements[i];

         answer_value = oAnswer.value;

         if (answer_value == "1") {

            corrects = corrects + 1;

            document.getElementById(exe_name + "_" + i).src="/graphics/symbols/bullets/correct.gif"

         } else {

            document.getElementById(exe_name + "_" + i).src="/graphics/symbols/bullets/incorrect.gif"

         }

      }

      grade = Math.round(corrects * 100 / num_q);

      document.getElementById("result_" + exe_name).innerHTML = "äêèê àÛÕß  " + corrects + " êèÒÙÜÙÝ ÞêÕÚ " + num_q + ", æÙÕàÚ " + grade;

   }



   function f_main_menu_select(id) {

      document.getElementById("dd_menu_chosen").src="/graphics/topics/" + id + ".gif";

   }



   function f_main_menu_select_default() {

      var myurlstr = String(window.location);

      var topicstr = "";

      var topic = "default";





      if (myurlstr.match("topics") == "topics") {

         topicstr = myurlstr.substring(myurlstr.indexOf("topics"),myurlstr.length);

         topicstr = topicstr.substring(7,topicstr.length);

         topicstr = topicstr.substring(0,topicstr.indexOf("/"));

         topic = topicstr.substring(0 ,topicstr.length);

      }



      document.getElementById("dd_menu_chosen").src="/graphics/topics/" + topic + ".gif";

   }



   function f_set_img_src(figure_id, src_id) {

      document.getElementById(figure_id).src=src_id;

   }



   function f_set_text_color(id, color) {

      document.getElementById(id).style.color=color;

   }



   function f_toggle_side_menu(side_menu_top_num) {



       if (side_menu_top_num == 10) {

          if (side_menu_education_status == 0) {

            side_menu_education_status = 1;

            document.getElementById("side_menu_education1").innerHTML="<a id='math' href='/topics/math/math.shtml'><font size ='2' color='black'>ÞêÞØÙçÔ</font></a>";

            document.getElementById("side_menu_education2").innerHTML="<a id='geography' href='/topics/geography/geography.shtml'><font size ='2' color='black'>ÒÙÐÕÒèäÙÔ</font></a>";

            document.getElementById("side_menu_education3").innerHTML="<a id='languages' href='/topics/languages/languages.shtml'><font size ='2' color='black'>éäÕê</font></a>";

            document.getElementById("side_menu_education4").innerHTML="<a id='internet' href='/topics/internet/internet.shtml'><font size ='2' color='black'>ÐÙàØèàØ</font></a>";

          } else {

            side_menu_education_status = 0;

            document.getElementById("side_menu_education1").innerHTML="";

            document.getElementById("side_menu_education2").innerHTML="";

            document.getElementById("side_menu_education3").innerHTML="";

            document.getElementById("side_menu_education4").innerHTML="";

          }

      } else if (side_menu_top_num == 11) {

          if (side_menu_knowledge_status == 0) {

            side_menu_knowledge_status = 1;

            document.getElementById("side_menu_knowledge1").innerHTML="<a id='inventions' href='/topics/inventions/inventions.shtml'><font size ='2' color='black'>êÒÜÙÕê ÕÔÞæÐÕê</font></a>";

            document.getElementById("side_menu_knowledge2").innerHTML="<a id='explorers' href='/topics/explorers/explorers.shtml'><font size ='2' color='black'>ÒÙÜÕÙ ÐèæÕê</font></a>";

          } else {

            side_menu_knowledge_status = 0;

            document.getElementById("side_menu_knowledge1").innerHTML="";

            document.getElementById("side_menu_knowledge2").innerHTML="";

          }

      } else if (side_menu_top_num == 12) {

          if (side_menu_freetime_status == 0) {

            side_menu_freetime_status = 1;

            document.getElementById("side_menu_freetime1").innerHTML="<a id='israel' href='/topics/israel/israel.shtml'>Ðèå-ÙéèÐÜ<font size ='2' color='black'></font></a>";

            document.getElementById("side_menu_freetime2").innerHTML="<a id='aquarium' href='/topics/aquarium/aquarium.shtml'>ÐçÕÕèÙÕÝ<font size ='2' color='black'></font></a>";

            document.getElementById("side_menu_freetime3").innerHTML="<a id='photography' href='/topics/photography/photography.shtml'><font size ='2' color='black'>æÙÜÕÝ</font></a>";

          } else {

            side_menu_freetime_status = 0;

            document.getElementById("side_menu_freetime1").innerHTML="";

            document.getElementById("side_menu_freetime2").innerHTML="";

            document.getElementById("side_menu_freetime3").innerHTML="";

          }

      }



   }