1function toggle(id)
 2{
 3    var icon = document.getElementById('toggle-' + id);
 4    if (icon != null)
 5    {
 6        var childElement = document.getElementById(id);
 7        if (icon.src.indexOf('Plus.gif') != -1)
 8        {
 9            icon.src = icon.src.replace('Plus.gif', 'Minus.gif');
10            if (childElement != null)
11            {
12                childElement.style.display = "block";
13            }
14        }
15        else
16        {
17            icon.src = icon.src.replace('Minus.gif', 'Plus.gif');
18            if (childElement != null)
19            {
20                childElement.style.display = "none";
21            }
22        }
23    }
24}