function MM_findObj(n, d) { //v4.0
  var p,i,x;  
  if(!d) 
  d=document; 
  		if((p=n.indexOf("?"))>0&&parent.frames.length) 
			{d=parent.frames[n.substring(p+1)].document;
			n=n.substring(0,p);}
		if(!(x=d[n])&&d.all) 
			x=d.all[n]; 
  for (i=0;!x&&i<d.forms.length;i++) 
  		x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) 
  		x=MM_findObj(n,d.layers[i].document);
  if(!x && document.getElementById)
  		x=document.getElementById(n);
 return x;
}

function MM_showHideLayers() { //v3.0
  var i,p,v,obj,args=MM_showHideLayers.arguments;
  for (i=0; i<(args.length-2);i+=3) 
  	{
	if ((obj=MM_findObj(args[i]))!=null) 
		{ v=args[i+2];
    	  if (obj.style) 
		  		{ obj=obj.style;
				v=(v=='show')?'visible':(v='hide')?'hidden':v;
				}

		obj.visibility=v;
		if (v=="hidden") v = "visible"; else v = "hidden";
		//invisibilitza_selects(v);
		}
	}
}