User System/ Preference

AdBlock Checker and Notifier FF IE10+ Chrome
This is a simple script that detects when the visitor is using a common Ad Blocker on your page, and enables you to style your page differently or display a custom message to coax these users into disabling Ad Blocker.

No right click script FF1+ IE5+
-User Submitted
This is a DHTML script that will prevent the default right menu from popping up when the right mouse is clicked on the web page. Use it to stop surfers from easily saving your web page, viewing its source, or lifting images off your site when using either IE 4+ or NS 4+. Definitely useful for many site owners...

No right click script II (on images) FF1+ IE5+
This alternate version of the no right click script targets only images, so right clicking is disabled only when attempting to save an image on the page. 

No right click script III (no alert) FF1+ IE5+
-User Submitted
A "silent" no right click script that disables right clicking on the page while NOT alerting any message.

Style Sheet Switcher (v1.1) FF1+ IE5+ Opr7+
This is a versatile "plug & play" style sheet switcher that lets your visitors switch between a list of alternative style sheets to apply to your site. With a change of style sheet the entire look of your site can be transformed. Cookies are used to enable persistence across site and for any number of days. It's time to make the switch!

Fluid Text Resizer FF1+ IE6+ Opr7+
Fluid Text Resizer, a compact yet versatile jQuery based text resizer script. It can adjust the text size of a particular section of your page, such as just the primary content area, multiple sections, or the entire document in general. A fluid animation is used to morph into the new text size, and session cookies are used to remember the new setting. Cool!

Document Text Sizer FF1+ IE6+ Opr7+
-User Submitted
Sometimes the text size you've specified for your webpage isn't suitable to the viewer, depending on his browser configuration or OS. This useful script by Taewook uses Dynamic CSS to let the viewer himself modify the text size of the page on demand, by clicking on an Increase or Decrease Font Size link.

Screen resolution detection and notification FF1+ IE5+ Opr7+
A script that tests the surfer's screen size, and if it's not a certain size (ie: 800*600), suggests to the surfer to change resolution.

Screen Type Detection FF1+ IE5+ Opr7+
A script that detects the surfer's screen width, height, and color depth.

Encrypted Password FF1+ IE5+ Opr7+
Password protect your webpage with this encrypted password script!

Easy Email Scrambler FF1+ IE5+ Opr7+
This script encrypts any email link on your webpage to hide them from harvesters and spammers. The script shines in its ease of implementation and extensive browser compatibility.

Message encrypter FF1+ IE5+ Opr7+
This script scrambles regular text into encoded form using your selected "key." Recipients must then possess the key to be able to decipher the message. Great fun, with one practical use to send out encrypted emails to your friends.

Source Code Encrypter FF1+ IE5+ Opr7+
Scramble the source of any chunk of code, or the entire webpage, using this creative script. The encrypted code will still be interpreted properly by the browser, just difficult for us humans to read.

Disable Text Selection script FF1+ IE5+ Opr7
This is a simple script that lets you disable text selection (the ability to drag and select text) within any element on your page, such as a certain paragraph.