Allows you to hide all elements on an HTML page by their tag name. Extremely handy in getting around the "Windowless Elements" problem in IE, which is a bug that puts certain elements, most commonly select boxes, on top of any other element, no matter what. As you can imagine, this causes real problems with DHTML drop-down menus and such like. This is the simplest and quickest fix I've come up with, I simply set this function to run alongside the drop-down and all of the select tags vanish before a menu drops, then I run the show function when the menu retracts.

This is a quick and dirty function for preventing SQL Injection, the function is designed to clean any variable that will be concatenated into an SQL query. Apostrophes and Double-Quotes are changed to entities in order to ensure that encoding does not become an issue when the content is pulled back into a page. I'm looking for criticism here, I want to know if this is secure or not.