This is not working and I can't figure out where I went wrong:

<style>
* {
margin: 0px
}  

div {
    height: 250px;
    width: 630px;
    overflow: hidden;
    vertical-align: top;
    position: relative;
}
  iframe {
    position: absolute;
    left: -50px;
    top: -130px;
  }
</style>
<script>
window.onload = function() {
   document.getElementsByTagName('body')[0].onkeyup = function(e) { 
      var div = document.getElementById('capture');
      if(e.keyCode == 70) {
         if(div.style.height == 250){
             alert("Yes");
         }
         else {alert("no");}
      }
   }
};
</script>