Hello, I wish to create a website, provide simple upload and download photo among a group, and give comment to those picture. Can i just use Ajax and javascript to do it ? Because i don't have strong programming in php, and i just start learning Ajax and don't really know what Ajax can do. Can anyone please explain to me ?Thanks.

That's a very open-ended question. To write a fully Ajax enabled web site from scratch you'll need to know some server-side language as Ajax is a combination of client initiated background requests to a server-side web service of some description. However there are plenty of web services already written that you maybe able to use, modify or re-purpose.

However you are approaching the problem the wrong way, don't pick a technology and build a site using it, firstly define your requirements as fully as possible. Secondly go through them and define the architectural model, finally choose the best method for implementation that you feel is within your development skills.

For some examples of what can be done with Ajax see some of the famous sites such as Flickr, or Yahoo Pipes or read one of Wrox's books such as Beginning or Professional Ajax.

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Joe (Microsoft MVP - XML)

Thanks for your advise, Joe. I am now reading the Professional Ajax by Wrox. Actually i am a beginner in web design and i would like to implement my website that have the function above. I read through the introduction for Professional Ajax and i though it is suitable for me. But after a few chapter, i found that i require php skills in order to complete the task. So, should i continue to learn Ajax or fin some book related to php and Ajax ?

Well as I said you'll need to know some sort of server-side language. If the server you will deploy to supports PHP then that's fine or maybe go with one of the other big ones such as ASP.NET or Java/JSP.

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Joe (Microsoft MVP - XML)