// Changes the class of the given tag from classa to classb or back
 function classoggle(tag, classa, classb) {
     if (tag.className==classa){
         tag.className=classb;
     } else {
         tag.className=classa;
     }
 }
 
 // Toggles the class name of the indexed div between 'hideMe' and 'showMe'
 // and toggles the src attribute of the referenced img tag between openPicture and closePicture
 function visoggle(divID, img) {
     var d = document.getElementById(divID);
     classoggle(d, 'hideMe', 'showMe');
     if (img!=undefined && img != 'null') {
         if (img.src == closePicture){
             img.src = openPicture; 
         } else {
             img.src = closePicture;
         }
     }
 }
 
 // Toggles the indicated image and collapses all other ones
 function visoggleSolo(divID, prefix, img, anchor, tagName){
     var d = document.getElementById(divID);
     var isHid = d.className == 'hideMe';
     var noImg = img=='null';
     collapseAll(prefix, 0, noImg, tagName);
     if (isHid){
         if (noImg) {
             visoggle(divID);
         } else {
             visoggle(divID, img);
         }
     }
     if (anchor != 'null') { 
         location.hash=anchor;
     }
 }
 
 // Collapses and changes the image for all tags that start with the given prefix. Expands them if exp=1
 function collapseAll(start, exp, noImg, tagName) {
         var cTag = 'div';
         if(tagName != undefined && tagName!='null'){
             cTag = tagName;
         }//if
         var expand = exp==1;
         var doimages = true;
         if (noImg) {
             doimages = false;
         }//if
         if (expand) {
             if(doimages){
                 var newPic = openPicture;
                 var oldPic = closePicture;
             }//if
             var newClass = 'showMe';
         } else {
             if(doimages){
                 var newPic = closePicture;
                 var oldPic = openPicture;
             }//if
             var newClass = 'hideMe';
         }//else
         if(doimages){
             var allImgs = document.getElementsByTagName('img');
             for (i=0; i < allImgs.length; i++) {
                 if (allImgs[i].name.indexOf(start) == 0){
                     allImgs[i].src = newPic;
                 }//if
             }//for
         }//if
         var allDivs = document.getElementsByTagName(cTag);
         for (i=0; i < allDivs.length; i++) {
             if (allDivs[i].id.indexOf(start) == 0) {
                 allDivs[i].className = newClass
             }//if
         }//for

     }//function