&showsearch=0 right after &rel=-0
<iframe width="560" height="315" src="http://www.youtube.com/embed/iROYzrm5SBM?rel=0;showsearch=0" frameborder="0" allowfullscreen></iframe>
<iframe width="420" height="315" src="http://www.youtube.com/embed/79IYZVYIVLA?rel=0;showsearch=0" frameborder="0" allowfullscreen></iframe>