【vertical_align】
<!DOCTYPE html>
<html>
<head>
<style type='text/css'>
a img {
vertical-align: middle;
}
</style>
</head>
<body>
<div class="header_bg">
<div class="header">
<a href="index.html"><img src="http://www.yjpub.cn/style/download.png"/></a>
<a id="lehrer">Text</a>
</div>
</div>
</body>
</html>
