Cross browser Testing of Web application

After spending years in the testing of web applications the few things that i always listen after deployment is that
"SORRY BOSS I HAVE NOT TESTED THIS FUNCTIONALITY IN THIS BROWSER VERSION"
 this thing hurts not only the Developer, QA but also to the company for great extent. You can't restrict web user to use specific web browser and then specific version of that specific web browser as a result many bugs goes un seen and when they were caught, that might be to late....

GIVE ME THE PRACTICAL ANSWER NOT THE THEORY 

Here is the list of tools that can be used for cross browser testing of webapplications




Tell your boss that here is the list of tools that can ease our life....

1. IE Tab

an add-on of Firefox & Chrome very light version. using this tool you can analyze how your application will look like in IE

2. IE Tester

if you like to analyze your application in different versions of IE use this tool

3. Spoon Browser Sandbox:

an excellent tool to check all browsers all versions

4. Cloud Testing
Cloud Testing service allows you to automate the functional and cross browser testing of your websites using the industry standard Selenium framework and real browsers real operating systems.
How it works

    Record your user journey using your browser and Selenium IDE.
    Upload the script to our website.
    Run the script using real browsers on real operating systems in our testing cloud.
    Review the results (screenshots, HTML & component diagnostics).

Re-run the tests manually whenever you need, or schedule regular tests.

http://www.cloudtesting.com/

5. Cross Browser Testing
Test your website live via your browser and remote VNC sessions.
Now you can interactively test your ajax, javascript, and flash on all operating systems and browsers from anywhere!
http://crossbrowsertesting.com/