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var current;
function tree_unhide(whichLayer,old) {
if (current == null) current = old;
var oldtree = document.getElementById('SID_'+current).style;
oldtree.display = 'none';
if (document.getElementById) {
// this is the way the standards work
var newtree = document.getElementById(whichLayer).value;
var newtree_div = document.getElementById('SID_'+newtree).style;
newtree_div.display = 'block';
/*
} else if (document.all) {
// this is the way old msie versions work
var style2 = document.all[whichLayer].style;
style2.display = style2.display ? '':'block';
} else if (document.layers) {
// this is the way nn4 works
var style2 = document.layers[whichLayer].style;
style2.display = style2.display ? '':'block';
*/
}
current = newtree;
}
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