i want on button click browse files without using the fileuploader
You can't get direct access to the user's filesystem [read or write]. That would be a huge security flaw in JavaScript. The file selector is defined by windows... and it is the only way you can allow a user to browse for a file. [unless you want to bring in ActiveX and non-javascript code]
Not sure if this is what you're looking for, but this is a way to browse for files without seeing the input box
As mentioned in the article, something like this is not recommended and support for it will probably be phased out in the future.
Do what Facebook does, Create an Applet which can act as a Windows Explorer window to your HDD. That applet must always ask the client user if he can accept the applet to browse his personal drive.
OR
Write a Flash Object which does the same thing as the applet example I wrote above.
Other than that, there's nothing other than the <input type="file" />
element.