I needed a function to check the difference between 2 dates in javascript. I couldn't find a suitable one, so I created this one:

function dateDiff(datepart, fromdate, todate)// datepart: 'w', 'd', 'h', 'n', 's'
{
	datepart = datepart.toLowerCase();
	var diff = todate - fromdate;
	var divideBy = {
	w:604800000 //1000*60*60*24*7
	, d:86400000 // 1000*60*60*24
	, h:3600000 // 1000*60*60
	, n:60000 // 1000*60
	, s:1000
	};
	return Math.floor(diff/divideBy[datepart]);
}

I always used version 2 of the best wysiwyg editor out there: FCKeditor. But it began to show it's age, and some functions didn't work like I wanted. So I checked for an upgrade. And yes, did they have one! A completely rewritten editor, now dubbed CKeditor, created by CKsource.com. It looks good, works good, and was easy to integrate.
But because you have to pay for the filemanager, and there is a free alternative, I created the CFM connector for CKeditor's alternative Filemanager!

If you want to check whether your visitor has the Cortona 3D viewer plugin installed in the browser, you can use the following javascript:

Wouldn't you like to know how many people have read your blog post? Well, I do like so. In the blog system mangoBlog, which I use for this weblog, this wasn't a default option, and there wasn't a plugin yet to add this.

So, I created the Viewcount plugin. It shows the text "View count: xx" underneath this post...

I created a javascript toJson() function, which recursively converts any javascript object to json (javascript object notation).
The function relies on jQuery, and is added to the main jQuery object '$'. So, you can call $.toJSON(obj).