function getObjById(layer_ref) { 
if (document.all) { //IS IE 4 or 5 (or 6 beta) 
return (eval( "document.all." + layer_ref));
} 
if (document.layers) { //IS NETSCAPE 4 or below 
return(document.layers[layer_ref]);
} 
if (document.getElementById &&!document.all) { 
return(document.getElementById(layer_ref));
} 
}