// requires div id array see below... //
// var ids=new Array('a1','a2','a3','a4','a5'); //

function switchid(id){	
   hideallids();
   showdiv(id);
}

function hideallids(){
   //loop through the array and hide each element by id
   for (var i=0;i<ids.length;i++){
      hidediv(ids[i]);
   }        
}

function hideallidsarr(){
   //loop through the array and hide each element by id
   for (var i=0;i<ids1.length;i++){
      hidediv(ids1[i]);
   }        
}

function showallarr(){
   //loop through the array and show each element by id
   for (var i=0;i<ids2.length;i++){
      showdiv(ids2[i]);
   }        
}

function hidediv(id) {
   //safe function to hide an element with a specified id
   if (document.getElementById) { // DOM3 = IE5, NS6
      document.getElementById(id).style.display = 'none';
   }
   else {
      if (document.layers) { // Netscape 4
         document.id.display = 'none';
      }
      else { // IE 4
         document.all.id.style.display = 'none';
      }
   }
}

function showdiv(id) {
   //safe function to show an element with a specified id
        
   if (document.getElementById) { // DOM3 = IE5, NS6
      document.getElementById(id).style.display = 'block';
   }
   else {
      if (document.layers) { // Netscape 4
         document.id.display = 'block';
      }
      else { // IE 4
         document.all.id.style.display = 'block';
      }
   }
}