Sometimes you need to do preg_replace on user input. Don't forget to escape all special characters or you'll get funny results. Here is how:

A class to convert km/h to mph and knots and vice-versa. It can also parse speeds in a text and return the text with corrected and converted speeds. See the live demo at http://ultralight-airplanes.info/yspeed.html for better idea what can it do.

Thanks for the feedback guys. Yeah, I know what you mean now, Proicons. At this moment I have no solution to any of these. This is raster drawing, so you can't move objects as vectors. Maybe in some future version, if ever.

Proicons, I can't reproduce the erase problem. Are you sure you have not clicked on "Clear canvas" button? Traces are known issue, can't solve it at the moment.

Hawkee, thanks. Sure, here's the demo URL: http://re.trotoys.com/rocanvas/rocanvas.html

There are two boards on that page with the JS code shown.

This is a javascript class that converts the HTML 5 Canvas element into interactive drawing board with tools etc. The code below contains the full class, but I recommend downloading the zip from http://re.trotoys.com/article/rocanvas/ because it contains CSS, images and samples. The code is Apache licensed so you can use it on your sites without any issues.

Thanks mate :) I don't remember how I found this site but I like it. Good work!

You mean the front page of calendarscripts? yeah, most wrote myself.

Thanks. Yeah, all code is mine there as well.
Sunslayer, thanks for the suggestion, 5/11 is indeed much better.

This is rather simple stuff yet I see it so rarely used. In any dating sites, health calculators, DIY stuff calculators etc they ask you to enter weight and height of something (or your own weight and height) only in their preferred measurement system (metric or Imperial). Boring! This simple javascript will convert the units and instantly fill the appropriate fields in the form.