How to upload a PFD to server

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Javascript

Referring to Mini Ajax File Upload Form[^] and its demo, I created a .htm file. In this page, there is only a Upload button. After I clicked the button, I could navigate to a folder to select a file. The file name thus displayed on the page.
I also tried the code in http://www.w3schools.com/jsref/tryit.asp?filename=tryjsref_fileupload_files. I could select a file. But there is no further action for how to save the selected file.
But I don't know what else should I do to save the file into my server. Thanks if you can help.