<style> .thumbnail IMG { FLOAT: left; MARGIN: 10px; WIDTH: 83px; height:83px; Border-style:double; Border-color:#dddddd; Border-width:3px; margin:2px } .thumbnail IMG a:hover{border-width:5px; border-style:solid; border-color:#000000; background-color:#333;} </style> <DIV class=thumbnail><A href="http://www.elcell.co.uk/ebayimages/itemimages/iPod/Metal/CLASSIC/I-AL-SAFECLASSICSILVER_1.jpg" target=_blank alt border="0"><IMG alt="" src="http://www.elcell.co.uk/ebayimages/itemimages/iPod/Metal/CLASSIC/I-AL-SAFECLASSICSILVER_1.jpg" border=0></A></DIV>
 提示：您可以先修改部分代码再运行

.thumbnail img a:hover

这一段， 没有作用

<style> .thumbnail IMG { FLOAT: left; MARGIN: 10px; WIDTH: 83px; height:83px; Border-style:double; Border-color:#dddddd; Border-width:3px; margin:2px } .thumbnail a:hover IMG{border-width:5px; border-style:solid; border-color:#000000; background-color:#333;} </style> <DIV class=thumbnail><A href="http://www.elcell.co.uk/ebayimages/itemimages/iPod/Metal/CLASSIC/I-AL-SAFECLASSICSILVER_1.jpg" target=_blank alt border="0"><IMG alt="" src="http://www.elcell.co.uk/ebayimages/itemimages/iPod/Metal/CLASSIC/I-AL-SAFECLASSICSILVER_1.jpg" border=0></A></DIV>
 提示：您可以先修改部分代码再运行

楼上的这一段， 还是没有用

img有子标签吗？

<style> .thumbnail IMG { FLOAT: left; MARGIN: 10px; WIDTH: 83px; height:83px; Border-style:double; Border-color:#dddddd; Border-width:3px; margin:2px } .thumbnail IMG:hover{border-width:5px; border-style:solid; border-color:#000000; background-color:#333;} </style> <DIV class=thumbnail><A href="http://www.elcell.co.uk/ebayimages/itemimages/iPod/Metal/CLASSIC/I-AL-SAFECLASSICSILVER_1.jpg" target=_blank alt border="0"><IMG alt="" src="http://www.elcell.co.uk/ebayimages/itemimages/iPod/Metal/CLASSIC/I-AL-SAFECLASSICSILVER_1.jpg" border=0></A></DIV>
 提示：您可以先修改部分代码再运行

很遗憾的告诉你不支持IE6

原来是不支持IE6.。