function getAbsoluteDivs()   
{   
    var arr = new Array();   
    var all_divs = document.body.getElementsByTagName("DIV");   
    var j = 0;   
  
    for (i = 0; i < all_divs.length; i++)   
        if (all_divs.item(i).style.position=='absolute')   
        {   
            arr[j] = all_divs.item(i);   
            j++;   
        }   
  
    return arr;   
}   
  
function bringToFront(id)   
{   
    if (!document.getElementById ||   
        !document.getElementsByTagName)   
        return;   
  
    var obj = document.getElementById(id);   
    var divs = getAbsoluteDivs();   
    var max_index = 0;   
    var cur_index;   
  
    // Compute the maximal z-index of   
    // other absolute-positioned divs   
    for (i = 0; i < divs.length; i++)   
    {   
        var item = divs[i];   
        if (item == obj ||   
            item.style.zIndex == '')   
            continue;   
  
        cur_index = parseInt(item.style.zIndex);   
        if (max_index < cur_index)   
        {   
            max_index = cur_index;   
        }   
    }   
  
    obj.style.zIndex = max_index + 1;   
}   
  
function sendToBack(id)   
{   
    if (!document.getElementById ||   
        !document.getElementsByTagName)   
        return;   
  
    var obj = document.getElementById(id);   
    var divs = getAbsoluteDivs();   
    var min_index = 999999;   
    var cur_index;   
  
    if (divs.length < 2)   
        return;   
  
    // Compute the minimal z-index of   
    // other absolute-positioned divs   
    for (i = 0; i < divs.length; i++)   
    {   
        var item = divs[i];   
        if (item == obj)   
            continue;   
  
        if (item.style.zIndex == '')   
        {   
            min_index = 0;   
            break;   
        }   
  
        cur_index = parseInt(item.style.zIndex);   
        if (min_index > cur_index)   
        {   
            min_index = cur_index;   
        }   
  
    }   
  
    if (min_index > parseInt(obj.style.zIndex))   
    {   
        return;   
    }   
  
    obj.style.zIndex = 1;   
  
    if (min_index > 1)   
        return;   
  
    var add = min_index == 0 ? 2 : 1;   
  
    for (i = 0; i < divs.length; i++)   
    {   
        var item = divs[i];   
        if (item == obj)   
            continue;   
  
        item.style.zIndex += add;   
    }   
}