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html點選小圖檢視大圖

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
  <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
  <title>
    點選小圖切換大圖
  </title> 

  <style> 

  .small_img,.big_img {
    cursor: pointer;
  } 
  .black_overlay{ 
    display: none; 
    position: absolute; 
    top: 0%; 
    left: 0%; 
    width: 100%; 
    height: 100%; 
    background-color: black; 
    z-index:1001; 
    -moz-opacity: 0.8; 
    opacity:.80; 
    filter: alpha(opacity=80);  
  } 
  .big_img { 
    display: none; 
    position: absolute; 
    width: 120px;
    height: 120px;
    left: 50%;
    top: 50%;
    margin: -60px 0px 0px -60px;
    z-index:1002; 
    overflow: auto; 
  }
  </style> 
</head> 
<body> 

  <img class="small_img" src ="img/icon_title_bar.png" onclick="document.getElementById('light').style.display ='block';document.getElementById('fade').style.display='block'"/>

  <img id="light" class="big_img" src ="img/icon_title_bar.png" onclick = "document.getElementById('light').style.display ='none' ;document.getElementById('fade').style.display='none'"/>

  <div id="fade" class="black_overlay"></div> 

</body> 

</html>