How to have high quality video from YouTube in blogger?

For having high quality videos playing from YouTube, add
&ap=%2526fmt%3D18
to the end of
http://www.youtube.com/v/t1pDtotH64g&hl=en&fs=1
so the lines of code will look like
http://www.youtube.com/v/t1pDtotH64g&hl=en&fs=1&ap=%2526fmt%3D18

See the quality difference from the video on the previous post.