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Internet Explorer Loses Focus After Pressing ENTER
http://www.vistaarticles.com/articles/209/1/Internet-Explorer-Loses-Focus-After-Pressing-ENTER
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Published on 12/10/2006
 
The browser window may lose focus when you press ENTER.

Internet Explorer Loses Focus After Pressing ENTER

This behavior is by design.

To work around this behavior, use the <IMG> tag instead of using the <input type="image"> tag in a HTML page

This behavior occurs because Internet Explorer thinks that the <input type="image"> tag in a HTML page is the default element for the page.