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Yeah! you should detect the browser! The navigator object contains all the information you need. http://web-design-lessons.com/articles/article/1/JavaScript%20Browser%20Detection

navigator object has a language of the browser. You can see all the attributes that has navigator using operator in: for(attr in navigator)...

First of all you should create an image instance. e.g. $img = Imagecreatefromjpeg('path/image.jpg'). After you can do everything with this image instance $img. It does not matter to re-size first or...

There are many PHP mvc frameworks. E.g Yii is better than Zend. The last is complex and takes many resources. It works slowly.

Do it with MARGIN help. Float is also needable property. #header{position:relative;float:left;width:80%;margin:0px 10% 0px 10%;}
take a look at this

just like to other elements.
http://web-design-lessons.com/articles/article/1/34

you should just notice floating in your css file: item1.{float:left;} item2.{float:right;}
source: http://web-design-lessons.com/articles/article/1/36

There are only tags with attributes in a special websites.
To see how to make website from the first steps visit html courses. Watch all of articles.

You don't need computer knowledges. All you need is Notepad or some editor. And some knowledges of HTML.
Html with examples here

You should learn the basics. It's not difficult to learn only HTML and CSS. It'll take 5-10 days to do this.
Visit this and other articles. There is small course of HTML and CSS

I wanted to say I give advices to newbies, who wants not to spend a lots of time to learn an unnecessary things.

Right. To an advanced HTML(and CSS) user divs are better. But I give advices to newbies. Firstly let them should learn basics.

this works fine

You're absolutely right. It is table-structed page making. It's not actual nowadays.
http://web-design-lessons.com/articles/article/1/14

Maybe robots.txt has userAgent string with value like IE.:)