Easiest way to remove background from an image

Hello-
I am using Adobe Photoshop CS3 Extended and I am working on trying to select a portion of a photo to use as a watermark. The photo is of a racecar in the foreground and I want to exclude the background (which is the road). Of the selection tools I really like the Magnetic Lasso tool to get in close on the objects edges but sometimes it selects areas I don't want. Does anyone know how to adjust the magnetic lasso tool once you have it all the way around an object? I've also tried the Magic Wand tool but found I couldn't drag it into a new document so that didn't work. I just need to find the easiest way to accomplish this task. Any help would be greatly appreciated. Thanks in advance for your help!

>I just need to find the easiest way to accomplish this task.
<br />
<br />The pen tool is not likely the fastest way to isolate the car from the background but it is certainly the most accurate. Learn to use the pen tool; you will not be disappointed.
<br />
<br />
<a href="http://www.pixentral.com/show.php?picture=1x5OZ6N5ZxMk2qJW3uG43AhJSxnCLT" /></a>
<img alt="Picture hosted by Pixentral" src="http://www.pixentral.com/hosted/1x5OZ6N5ZxMk2qJW3uG43AhJSxnCLT_thumb.jpg" border="0" />

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