function attach_image_link( imgobj ) {
  var formObj = document.getElementById('form_name'); 
  var isEmpty = false;

  if( formObj.affil_id.value == '' ) {
      alert('Please Enter Your Affiliate ID');
      formObj.affil_id.focus();
      isEmpty = true;
  } 
 
  if( !isEmpty ) { 
      for( var i=0; i<formObj.num_img.value; i++ ) {
      var imageObj = document.getElementById('image' + i);
      imageObj.className = 'image_box';
  }

    formObj.hl_box.value = imgobj.id;
    imgobj.className = 'image_selected'; 
    formObj.image_link.value = imgobj.src;
    formObj.submit();
  }
}

function checkValue() {
  alert('hello');
}