Popup Closer - Button
Description:
To get a popup window to close it is common to add a button that will allow the user to "Close Window".
Directions:
Below you will find the code required to create a "Close Window Button". You can change the text of the button by editing the "Close Window" to say whatever you would like. Use the 'Grab Text' buttons to select the code within the adjacent textarea. Then use Control-C or Edit -> Copy to buffer the text for pasting into your document.

Close Window Button: Insert the following code between the <body> and </body> in the popup window where you want the link.

Then use Control-C to copy the text into your web page.