browser_version = parseInt(navigator.appVersion);
browser_type = navigator.appName;

if (browser_type == "Microsoft Internet Explorer" && (browser_version >= 4)) {
document.write("<link REL='stylesheet' HREF='estilos_ie.css' TYPE='text/css'>");
} 

else if (browser_type == "Netscape" && (browser_version >= 4)) {
document.write("<link REL='stylesheet' HREF='estilos_ns.css' TYPE='text/css'>");
}
function MM_jumpMenu(targ,selObj,restore){ //v3.0
  eval(targ+".location='"+selObj.options[selObj.selectedIndex].value+"'");
  if (restore) selObj.selectedIndex=0;
}