can u check wuts wrong wit this code?

sorry about the previous Q,
anyways, my friend showed me the code i was talking about
but its not working
when i put it on my javascript box, it worked
it pops out whenever someone enters my site
problem is, it doesnt respond to the "ok" buton
can u please check this code for me to see wuts wrong?
thank you!

<img src="" id="mycode"
style="height:expr/**/ession(alert('*SMiLE!*'));
width:expr/**/ession
(document.all.mycode.style.height='0px')" />