var nn4 = (document.layers) ? true : false;
var ie = (document.all) ? true : false;
var dom = (document.getElementById && !document.all) ? true : false;

function browser(id){
var path;
  if(nn4) {
	   path = document.layers[id];
	  }
      else if(ie) {
      path = document.all[id];
      }
      else {
      path = document.getElementById(id);
      }
    return path;  //return the path to the css layer depending on which browser is looking at the page
 }