function showlay(idname,show,parent){
	  var lay = document.getElementById(idname);
	  if(show==0) var v="hidden";
	  else var v="visible";

          lay.style.visibility=v;

          if(parent>0){
          for(i=0;i<parent;i++){
          lay=lay.parentNode;
          lay.style.visibility=v;
          }
	}
	}