// Taken from Mindmap html export.
// Here we implement folding. It works fine with MSIE5.5, MSIE6.0 and
// Mozilla 0.9.6.

if (document.layers) {
    //Netscape 4 specific code
    pre = 'document.';
    post = '';
}

if (document.getElementById) {
    //Netscape 6 specific code
    pre = 'document.getElementById("';
    post = '").style';
}

if (document.all) {
    //IE4+ specific code
    pre = 'document.all.';
    post = '.style';
}

function layer_exists(layer) {
   try {
      eval(pre + layer + post);
      return true
   } catch (error) {
      return false;
   }
}

function show_layer(layer) {
   eval(pre + layer + post).position = 'relative'; 
   eval(pre + layer + post).visibility = 'visible';
}

function hide_layer(layer) {
   eval(pre + layer + post).visibility = 'hidden';
   eval(pre + layer + post).position = 'absolute';
}

function hide_folder(folder) {
    hide_folding_layer(folder)
    show_layer('show'+folder);
    scrollBy(0,0); // This is a work around to make it work in Browsers (Explorer, Mozilla)
}

function show_folder(folder) {
    // Precondition: all subfolders are folded
    show_layer('hide'+folder);
    hide_layer('show'+folder);
    show_layer('fold'+folder);
    scrollBy(0,0); // This is a work around to make it work in Browsers (Explorer, Mozilla)
    var i;
    for (i=1; layer_exists('fold'+folder+'_'+i); ++i) {
       show_layer('show'+folder+'_'+i);
    }
}
function show_folder_completely(folder) {
    // Precondition: all subfolders are folded
    show_layer('hide'+folder);
    hide_layer('show'+folder);
    show_layer('fold'+folder);
    scrollBy(0,0); // This is a work around to make it work in Browsers (Explorer, Mozilla)
    var i;
    for (i=1; layer_exists('fold'+folder+'_'+i); ++i) {
       show_folder_completely(folder+'_'+i);
    }
}



function hide_folding_layer(folder) {
   var i;
   for (i=1; layer_exists('fold'+folder+'_'+i); ++i) {
       hide_folding_layer(folder+'_'+i);
   }
   hide_layer('hide'+folder);
   hide_layer('show'+folder);
   hide_layer('fold'+folder);
   scrollBy(0,0); // This is a work around to make it work in Browsers (Explorer, Mozilla)
}

function fold_document() {
   var i;
   var folder = '1';
   for (i=1; layer_exists('fold'+folder+'_'+i); ++i) {
       hide_folder(folder+'_'+i);
   }
}

function unfold_document() {
   var i;
   var folder = '1';
   for (i=1; layer_exists('fold'+folder+'_'+i); ++i) {
       show_folder_completely(folder+'_'+i);
   }
}