switch (BrowserDetect.OS) { case "Windows" : switch (BrowserDetect.browser) { case "Explorer" : switch(BrowserDetect.version){ case 7 : document.write (''); break; case 6 : document.write (''); break; default: break; } break; case "Firefox" : if (BrowserDetect.version == 2) { document.write (''); } break; default: break; } break; case "Mac" : break; case "Linux" : break; default: break; }