I am a total noob with PHP so that code is like abracadabra for me

But I did take a look at the coding of one of the pages with embedded video and there this is (between a tags):
`
<span style="display:block;width:1024px;height:682px;" class="textobject"><iframe width="520" height="390" src="http://www.youtube.com/embed/ofKLYLCYIoM?rel=0" frameborder="0" allowfullscreen></iframe>
`
As I understand it. that says that there is a "block" of 1024px and in there, there is the embedded video of 520px?
About the code you did give, where do I place that?