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On using Google I found that they are using onclick events in anchor tags.
In more option in google header part, it looks like normal a tag, but onclicking it doesn't get redirected but opened a menu. Normally when using
<a href='more.php' onclick='show_more_menu()'>More >>></a>
It usually goes to 'more.php' without firing show_more_menu(), but I have show a menu in that page itself. How to do like google?