browser_version = parseInt(navigator.appVersion);
browser_type = navigator.appName;
if (browser_type == "Microsoft Internet Explorer" && (browser_version >= 4)) {
document.write("<link rel='stylesheet' href='css/picpopup_ie.css' type='text/css'>");
} 
else {
document.write("<link rel='stylesheet' href='css/picpopup.css' type='text/css'>");
}