var DHTML = (document.getElementById || document.all || document.layers);

function getObj(name)
{
  if (document.getElementById)
  {
  	this.obj = document.getElementById(name);
	this.style = document.getElementById(name).style;
  }
  else if (document.all)
  {
	this.obj = document.all[name];
	this.style = document.all[name].style;
  }
  else if (document.layers)
  {
   	this.obj = document.layers[name];
   	this.style = document.layers[name];
  }
}

function show_layer(status,dis,layername)
{
	if (!DHTML) return;
	var x = new getObj(layername);
	x.style.visibility = status;
	x.style.display = dis;
}

function hide_all()
{
	if (!DHTML) return;
			var x = new getObj('layer1');
			x.style.visibility = 'hidden';
			x.style.display = 'none';
			var x = new getObj('layer2');
			x.style.visibility = 'hidden';
			x.style.display = 'none';
			var x = new getObj('layer3');
			x.style.visibility = 'hidden';
			x.style.display = 'none';
			var x = new getObj('layer4');
			x.style.visibility = 'hidden';
			x.style.display = 'none';
			var x = new getObj('layer5');
			x.style.visibility = 'hidden';
			x.style.display = 'none';
			var x = new getObj('layer6');
			x.style.visibility = 'hidden';
			x.style.display = 'none';
			var x = new getObj('layer7');
			x.style.visibility = 'hidden';
			x.style.display = 'none';
			var x = new getObj('layer8');
			x.style.visibility = 'hidden';
			x.style.display = 'none';
		
}