// this function is needed to work around
// a bug in IE related to element attributes
function hasClass(obj)
{
    var result = false;
    if (obj.getAttributeNode("class") != null)
    {
        result = obj.getAttributeNode("class").value;
    }
    return result;
}

function stripe(id)
{
    // the flag we'll use to keep track of
    // whether the current row is odd or even
    var even = false;

    // if arguments are provided to specify the colors
    // of the even & odd rows, then use the them;
    // otherwise use the following defaults:
    var evenColor = arguments[1] ? arguments[1] : "#fff";
    var oddColor  = arguments[2] ? arguments[2] : "#ddd";

    // obtain a reference to the desired table
    // if no such table exists, abort
    var table = document.getElementById(id);
    if (! table) { return; }

    // by definition, tables can have more than one tbody
    // element, so we'll have to get the list of child
    // <tbody>s
    var tbodies = table.getElementsByTagName("tbody");

    // and iterate through them...
    for (var h = 0; h < tbodies.length; h++)
    {
        // find all the &lt;tr&gt; elements...
        var trs = tbodies[h].getElementsByTagName("tr");

        // ... and iterate through them
        for (var i = 0; i < trs.length; i++)
        {
            // avoid rows that have a class attribute
            // or backgroundColor style
            if (! hasClass(trs[i]) &&
                ! trs[i].style.backgroundColor)
            {
                // get all the cells in this row...
                var tds = trs[i].getElementsByTagName("td");

                // and iterate through them...
                for (var j = 0; j < tds.length; j++)
                {
                    var mytd = tds[j];

                    // avoid cells that have a class attribute
                    // or backgroundColor style
                    if (! hasClass(mytd) &&
                        ! mytd.style.backgroundColor)
                    {
                        mytd.style.backgroundColor =
                            even ? evenColor : oddColor;
                    }
                }
            }
            // flip from odd to even, or vice-versa
            even =  ! even;
        }
    }
}

function toggle_invis( name )
{
    var filter =
        { acceptNode:
          function( node )
          { var classname = node.id;
            if( classname )
            { var classbase = classname.substr( 0, name.length );
              if( classbase == name ) { return NodeFilter.FILTER_ACCEPT; } }
            return NodeFilter.FILTER_SKIP; } };
    var walker = document.createTreeWalker( document.body           ,
                                            NodeFilter.SHOW_ELEMENT ,
                                            filter                  ,
                                            false                   );
    while( walker.nextNode() )
    {
        var e = walker.currentNode;
        if( e.style.display == "none" ) { e.style.display = "inline"; }
        else                            { e.style.display = "none";   }
    }
}