<body>
  <div id="transparentDiv">
  </div>
  <div id="dialogDiv" onclick="closeModal();">
  </div>
  <div id="mainDiv">
  <img src="joowww.jpg" alt="" onclick="loadPic('joowww_big.jpg');" />
  <img src="php102.jpg" alt="" onclick="loadPic('php102_big.jpg');" />
  <img src="php5pk.jpg" alt="" onclick="loadPic('php5pk_big.jpg');" />
  </div>
</body>