Making file select dialog for selecting files of particular extensions

[computerzworld]

Hello,
I want to make my file select dialog box should allow to select only certain type of extensions like .jpg,.gif,.png etc. So when I click on upload button it should give the file select dialog with file types .jpg,.gif & .png no other types can be allowed. Is it possible anyhow via javascript or PHP or something else? Please help me. Thanks in advance.

[scrupul0us]

You'll have to validate the mime type of the files in-code. The file select dialogue will allow all file types to be shown/selected.

[computerzworld]

so according to you it is not possible to have the control of file dialog in our hand? I mean we can not make all files to specific file types in file dialog?

[scrupul0us]

As far as I know, the standard html form upload allows all filetypes to be shown/selected.

[computerzworld]

but can we tweek it using coding(Either javascript/PHP/anything else) to select only particular kind of extensions? If yes then how? Please help me. Thanks.