Drupal 6.x

I am working on a test site and as such no caching is enabled.
I am using latest version of firefox and firebug and broswer caching is disabled.
Recently I have been having the following issue - I make a change to one of my .js file and upload it to my apache webserver running on linux.

I refresh my page and the updated file is not picked up, I then flush drupal caches and sometimes the change get picked up and sometimes it doesn't.

I'm building a multi step form in my own module. I have a couple of required fields in "step 2" with buttons Next and Back. When I press Back with empty required fields, FAPI shows me the standard warning.
Is it possible to avoid this validation, when certain button (Back obviously) is pressed to have an ability move back to "step 1" without entering anything in required fields?

There is a security issue between path_redirect module(version 6.x-1.0-beta3) and drupal core version 6.29.

user warning: Unknown column 'INF' in 'where clause' query

Suppose I have a single virtual machine (Debian) hosting many Drupal websites. Each website has their own docroot and is running under their own OS user account.

By default, Drupal sets the "Temporary directory" to "/tmp". This means that each Drupal website is sharing the same "/tmp" directory. Normally this does not cause a problem but some contrib modules do silly things like create a directory and then create temp files in there.

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I saw a website in which they have put a tabbed content inside of the middle content area. I wonder if this is possible using some module or by using some paneling. I would so grateful for any idea. Example of the website where I saw such tabs is as below:

http://file54.com/Temp/question.jpg