jQuery: Open File Upload window by pressing a link or image.?

Is this possible to open a File Upload window when clicking on a image or link. (like what exactly in the <input typ开发者_JS百科e="file" name="upload" />).

Take a look at the jQuery ajax upload plugin. It allows to upload files via "ajax" (technically not really, but the effect is the same) and doesn't use input buttons (technically it does, but they are invisible).