Which language is required to set up a web application?

I'd go with PHP but you can use them both, but Myspace and Facebook also use other languages like ajax.

W3Schools Online Web Tutorials

That is an awesome website to learn if you are just starting out.

yeah i have seen this website. Its an awesome website for learning languages but for making app we need some ideas where can i find ideas?

Thisa depends on specialty and general aims. The first 3 are most common.

These could be used.
c# / vb.net
php and related
javascript / java
coldfusion

IVe been hearing good things about java for web apps.

For interactive contents, a combination of a XML socket server, a SQL database, PHP or ColdFusion or ASP.NET, and Flash has been the popular choice nowadays. Java is good but I think it's mostly better being the back-end, controlling the server, rather than being a front-end, interacting with the user.

As such, I'd advise you take a closer look at PHP, MySQL (most popular SQL database, I think?), and ActionScript 3.0 for Flash and Flex application development.

As for ideas, those are what you have to figure out yourself.

MySQL would likely be the most easily used (and cheap) database. But the most widely used the the big projects are still Oracle and SQL server.

PHP would definably be helpful.

Depending on how fancy you want to get, JavaScript/AJAX on the front end. C#(or anything .NET) or Java on the back. But you need to be careful with JAVA on the server side as it runs on a virtual machine and compiles to machine code at run time severely hampering performance.

For interactive contents, a combination of a XML socket server, a SQL database, PHP or ColdFusion or ASP.NET, and Flash has been the popular choice nowadays. Java is good but I think it's mostly better being the back-end, controlling the server, rather than being a front-end, interacting with the user.

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JSP, combined with servlets are normally what Java developers use for creating the dynamic web pages, while you have a Java engine as a backend. It is quite the nifty technology if I may say. I do not have much experience as a web programmer, but among the two tecnologies I've used (PHP and JSP) I prefer the later.

But you need to be careful with JAVA on the server side as it runs on a virtual machine and compiles to machine code at run time severely hampering performance.

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Pardon? At worst Java will run its just in time compiler once per application, so only the first person to load the web page will see any slowdown, all the rest will use the already existing compiled application.