Whoa, ok let’s take a step back and use an actual WordPress function, that way your not doing anything weird like the above.
Use these:
http://codex.wordpress.org/Function_Reference/wp_get_attachment_image (the images)
http://codex.wordpress.org/Function_Reference/wp_get_attachment_image_src (array with atributes)
http://codex.wordpress.org/Function_Reference/the_post_thumbnail (featured image)
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