function hide(s) {
     if (document.all) {
       if (document.all[s]) {
	 document.all[s].visibility="invisible";
	 eval("document.all."+s+".style.display=\"none\"");
       }
     } else {
       if (document.getElementById(s)) {
	 document.getElementById(s).visibility="invisible";
	 document.getElementById(s).style.display="none";
       }
     }
   }

 function show(s) {
   if (document.all) {
     if (document.all[s]) {
       document.all[s].visibility="visible";
       eval("document.all."+s+".style.display=\"block\"");
     }
   } else {
     if (document.getElementById(s)) {
       document.getElementById(s).visibility="visible";
       document.getElementById(s).style.display="block";
     }
   }
 }