ie6下pnghack——css方案
<!--[if lt IE 7]>
<style> h1 span { background: none; filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(src='gradient.png', sizingMethod='scale'); } </style>
<![endif]-->
<!--[if lt IE 7]>
<style> h1 span { background: none; filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(src='gradient.png', sizingMethod='scale'); } </style>
<![endif]-->