well essential, thanks a lot for such a nice explaination.
I got my answer,
but i dont need to learn plain javascript, bcoz already know.
Not will try on jQuery
anyways thanks a lot

Well i got it.
but now i have a question why should i use jQuery, instead of ajax and javascript.
Infect i know the ajax and javascript both very well and i frequently use both.
So genuinely...

my basic question is that can i use the jquery insted of php syntax ?

For example i developed a site in simple php, now i want to change the code for security perpose in jQuery..
Can I ??