function debug() {
   debug = document.getElementById('debug');
   if(!debug) {
      body = document.getElementsByTagName('body')[0];
      
   alert(body);
   
      debug = document.createElement('div');
      debug.id = 'debug';
      debug.style.position = 'absolute';
      debug.style.top = '0px';
      debug.style.left = '0px';
      debug.style.backgroundColor = '#fff';
      debug.style.color = '#000';
      body.appendChild(debug);
   }
}

function echo(text) {
   debug();
	debug_block = document.getElementById('debug');
	debug_block.innerHTML += text + "<br>";
}