The use of the sitepoint URL is simply for example.
Here is why this portion -
$.fn.colorbox.close(); window.open(this.href); [b]return false[/b];"
When you click a link, a window popup like a Modal Dialog box containing inline contents.
The problem is when the box pop up, there is a link in the box, which the user is suppose to click. However, when the user click the link the colorbox is still open or active on the screen and does not close or go away.
So adding the above code to the link closes the box when the link is clicked.
Otherwise the box remain open, even when clicking the link takes you to another page or tab, or when you hit the back button on the browser, the box is still open.
I can whip up an example but I was hoping this would be a simple fix.