function show( layername )
				{
					var x = new getObj(layername);
					x.style.visibility = 'visible';
					//x.style.display = "block";
				}
			
				function hide( layername )
				{
					var x = new getObj(layername);
					x.style.visibility = 'hidden';
					//x.style.display = "none";
				}
				
				function enable( layername )
				{		
					var x = new getObj(layername);
					//x.style.visibility = 'visible';
					x.style.display = "block";
				}
			
				function disable( layername )
				{
					var x = new getObj(layername);
					//x.style.visibility = 'hidden';
					x.style.display = "none";
				}
				
				function altern( layername )
				{
					var x = new getObj(layername);
					//x.style.visibility = 'hidden';
					if( x.style.display == "none" )
					{
							x.style.display = "block";
					} else {
							x.style.display = "none";
					}
				}
			
				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 = getObjNN4(document,name);
					this.style = this.obj;
				  }
				}
				
				function getObjNN4(obj,name)
				{
					var x = obj.layers;
					var foundLayer;
					for (var i=0;i<x.length;i++)
					{
						if (x[i].id == name)
						 	foundLayer = x[i];
						else if (x[i].layers.length)
							var tmp = getObjNN4(x[i],name);
						if (tmp) foundLayer = tmp;
					}
					return foundLayer;
				}