hello everyone... i don't have sound knowledge of javascript and work with php... i am making a image uploading website and need some javascript codes.. the code i am asking might be very simple but as i told that i know only 20-25% javascript so i dont know anything about them...i will be thankful if you provide code and explain them a bit.. 1> A code to allow user to check availability of his username without reloading the page by clicking on a button.. 2> A code to make link in drop down menu just as when we click on 'FORUM JUMP' of this website we get all the forums and sub-forums list and when we click on any topic it direct us to the desired topic page... 3> A code to show the strength of password as user type his password in registration form...
http://davidwalsh.name/ajax-username-availability-checker-mootools I think is what your looking for. Just google "ajax username checker or ajax password strength checker" that should help.
For the first point u need ajax (as you need to access a database). For the second and third javascript alone is enough.