Batch file to set homepage in all browsers

I want a batch file to change the homepage for all my browsers (IE, Chrome, Opera). Or maybe there is a solution using c#?

for Firefox I have this code:

 cd /D "%APPDATA%\Mozilla\Firefox\Profiles"
    cd *.default
    set ffile=%cd%
    echo user_pref("browser.startup.homepage", "http://ift.tt/1jBnDYz");>>"%ffile%\prefs.js"
    set ffile=
    cd %windir%