var last_expanded = '';

function showHide(id)
{
    var obj = document.getElementById(id);

    var status = obj.className;

    if (status == 'hide') 
    {

        if (last_expanded != '') 
        {
            var last_obj = document.getElementById(last_expanded);
            last_obj.className = 'hide';
        }

        obj.className = 'show';

        last_expanded = id;
    } 
    else 
    {
        obj.className = 'hide';
    }
}