What's deselectBloggerImageGracefully() means?

I found when I add a image to blogger, the editor adds the following script to the onblur event of the link. Does anybody what's it mean?

< a onblur="try {parent. deselectBloggerImageGracefully();} catch(e) {}" 
href="http://www.sun.com/images/ig/ig_javafx_architecture.jpg">
&ltimg style="margin: 0pt 10px 10px 0pt; float: left; cursor: pointer; width: 320px;"
 src="http://www.sun.com/images/ig/ig_javafx_architecture.jpg" 
alt="" border="0" />