/* Go to top of page */
      function topFunction() {
          document.body.scrollTop = 0;
          document.documentElement.scrollTop = 0;
      }
      
      /* open/close navigation optionally slide page */
      function openNav(slide) {
          if (document.getElementById("mySidenav").getAttribute("class").split(' ')[1] == "menuClosed") {
              document.getElementById("mySidenav").style.width = "300px";
              if (slide==1) {
                  document.getElementById("main").style.marginLeft = "300px";
              }
              document.getElementById("mySidenav").setAttribute("class","menu menuOpen");
              /* Scroll to top when opening menu */
              topFunction();
          } else {
              document.getElementById("mySidenav").style.width = "0";
              if (slide==1) {
                  document.getElementById("main").style.marginLeft = "0";
              }
              document.getElementById("mySidenav").setAttribute("class","menu menuClosed");            
          }
      }
      
      /* when scrolling down 20 pixel display upButton */
      function scrollFunction() {
          if (document.body.scrollTop > 20 || document.documentElement.scrollTop > 20) {
              upButton.style.display = "block";
          } else {
              upButton.style.display = "none";
          }
      }
  
      /* Test if the logo is present (to avoid displaying broken link icon on chrome) */
      function testLogo() {
          logo=document.getElementById("logoImgId");
          logodiv=document.getElementById("logoDivId");
          if (logo.naturalHeight == 0) {
              logodiv.setAttribute("style","display:none;");
          }
      }

      
      function tagToInfo(s5=false) {
          /* All H4 tags */
          var atags = document.getElementsByTagName('H4');

          /* extract configuration tags */
          tags=[];
          for (var i=0; i<atags.length;i++) {
              var s = atags[i].innerHTML;
              if (s.match(/^#/)) {
                  atags[i].innerHTML = s.replace('#','');
                  tags.push(atags[i]);
              }
          }
                  

          var n = tags.length < 3 ? tags.length : 2;
          for (var i=1; i <= n; i++) {

              /* first make the tag not displayed */
              tags[i-1].setAttribute("style","display:none;");

              /* If next sibling is a <br> make it display:none too */
              if (tags[i-1].nextElementSibling && tags[i-1].nextElementSibling.tagName == 'BR') {            
                  tags[i-1].nextElementSibling.setAttribute("style","display:none;");
              }
              if (s5) {
                  var s = tags[i-1].innerHTML;
                  document.getElementById("footinfo"+i).innerHTML = s;
              }

          }

      }
      
      /* Convert the two first tags into info */
      /* use tags for image/table/object attributes        */
      function tagToStyle() {
          /* All H5 tags */
          var atags = document.getElementsByTagName('H5');
          /* extract configuration tags */
          tags=[];
          for (var i=0; i<atags.length;i++) {
              var s = atags[i].innerHTML;
              if (s.match(/^#/)) {
                  atags[i].innerHTML = s.replace('#','');
                  tags.push(atags[i]);
              }
          }
                  
          if (tags.length > 0) {

              /* Image tags */

              for (var i=0; i < tags.length; i++) {
                  var ctag = tags[i];

                  ctag.setAttribute("style","display:none;");

                  /* If next sibling is a <br> make it display:none too */
                  if (ctag.nextElementSibling && ctag.nextElementSibling.tagName == 'BR') {
                      ctag.nextElementSibling.setAttribute("style","display:none;");
                  }

                  var s = ctag.innerHTML;

                  /* find next img/table/zim-object */                
                  ctag = findNextObject(ctag);
                  
                  /* either we found something either null */
                  if (ctag!=null) {
                      var style = ctag.getAttribute("style");
                      var res;
                      style = style == null ? '' : style;
                      if (s == "left") {
                          style = style + "float:left; margin-left:0; margin-right:1em;";
                      }
                      if (s == "right") {
                          style = style + "float:right; margin-left:1em; margin-right:0;";
                      }                    
                      if (res = s.match(/^height(.+)$/)) {
                          style = style + "height:"+res[1]+";";
                      }
                      if (res = s.match(/^width(.+)$/)) {
                          style = style + "width:"+res[1]+"; height:auto;";
                      }
                      if (res = s.match(/^fontsize(.+)$/)) {
                          style = style + "font-size:"+res[1]+"%;";
                      }
                      ctag.setAttribute("style",style);
                  }
                  
              }
              
          }
      }
  
      function findNextObject(tag) {
          /* try to found in current */

          var objectsTagClassArray=['IMG','','TABLE','','DIV','zim-object','UL','','OL',''];

          ob = findTagInSiblings(tag,objectsTagClassArray);
          if (ob == null) {
              ob = findTagInSiblings(tag.parentElement,objectsTagClassArray);
          }
          return ob;
      }
      
      function findTagInSiblings(tag,tagsToFind) {
          var notFound = true;
          var ctag = tag;

          var cctag;

          while (notFound) {
              ctag = ctag.nextElementSibling
              if (ctag == null) {
                  notFound = false;
                  break;

              }
              if (isTagInList(ctag,tagsToFind)) {
                  notFound = false;
                  break;
              }
              /* now search into children */
              if (ctag.childElementCount != 0) {
                  for (var i=0;i<ctag.childElementCount;i++) {
                      cctag=ctag.children[i];
                      if (isTagInList(cctag,tagsToFind)) {

                          notFound = false;

                          ctag=cctag;

                          break;

                      }

                  }

              }

          }        
          return ctag;

      }

  
      function isTagInList(tag,tagsToFind) {
          yes = false;
          for (var i=0; i < tagsToFind.length/2 ; i++) {
              if (tag.tagName == tagsToFind[i*2]) {
                  if (tagsToFind[i*2+1]=='') {
                      yes = true;
                      break;
                  } else if (tag.className == tagsToFind[i*2+1]) {
                      yes = true;
                      break;
                  }                
              }
          }                
          return yes;
      }