showLayer = function(lid)
            {
                l = document.getElementById('layer'+lid);
                t = document.getElementById('pTab'+lid);
                for( i = 0; i < l.parentNode.childNodes.length; i++ )
                {
                    
                    if( l.parentNode.childNodes[i] != l && l.parentNode.childNodes[i].style)
                        l.parentNode.childNodes[i].style.display = 'none';
                }
                l.style.display = '';
                i = 1;
                for ( i =1; i < 5; i++ )
                    if( e = document.getElementById('pTab'+i) )
                        if( e != t ) e.className = 'pTab';
                t.className = 'pTab-a';
                    
            }