You can send as many attachments as you like with a single email.
These instructions are for Outlook Express but they should be fairly similar with any method of sending mail:
Click 'Insert > File Attachment'.
Navigate to the folder (e.g. 'My Pictures'), where your pictures are located.
Click on the first one you want to select. Then, while holding the Ctrl key down, click on each of the others in turn.
Click 'Attach'
That's it. The only problem might be that the resulting file size of your email is too large to be accepted by your ISP (or alternative email service). Some email providers place a limit on the size of emails. The best way to find out if this applies to you is simply to try it.
If you really want to send all of your pictures as a single file, it's possible to compress them into just one 'zip' file. (There are also alternative compressed formats, such as 'rar'). To do so, you can either use the facility which is built into Windows XP and Vista (but not into earlier versions of Windows) or you can use an independent program, such as WinZip or PKZip. However, most picture files are in 'jpeg' format, which is already compressed. Putting your 9 pictures into a single zip file wouldn't make the resultant file much smaller, so it's hardly worth bothering. (Also, sending a zip file is pointless unless the recipient knows what to do with it. The recipient would have to 'unzip' it to view the pictures).
Chris