if(window.addEventListener){
   window.addEventListener('load',setDivDimensions,false);
 }
else { 
if(window.attachEvent){
   window.attachEvent('onload',setDivDimensions);
  }
 }

function setDivDimensions() {

   obj=document.getElementById('fullimage');
   obj1=document.getElementById('wrapper');

   obj.style.height=obj1.offsetHeight+'px';

 }