function setSrc(tab, id)
{	
	document.getElementById("current_"+id).id = '';
	tab.parentNode.id='current_'+id;
}

var cur_lyr = new Array();
function swapLayers(id, i) {
  if (cur_lyr[i] != '' ) hideLayer(cur_lyr[i]);
  showLayer(id);
  cur_lyr[i] = id;
}

function showLayer(id) {
  var lyr = getElemRefs(id);
  if (lyr && lyr.css) lyr.css.display = "block";
}

function hideLayer(id) {
var lyr = getElemRefs(id);
  if (lyr && lyr.css) lyr.css.display = "none";
}

function getElemRefs(id) {
	var el = (document.getElementById)? document.getElementById(id): (document.all)? document.all[id]: (document.layers)? document.layers[id]: null;
	if (el) el.css = (el.style)? el.style: el;
	return el;
}