<script>
function AutoResizeImage(maxWidth, maxHeight, objImg) {
var img = new Image();
img.src = objImg.src;
var hRatio;
var wRatio;
var Ratio = 1;
var w = img.width;
var h = img.height;
wRatio = maxWidth / w;
hRatio = maxHeight / h;
if (maxWidth == 0 && maxHeight == 0) {
Ratio = 1;
} else if (maxWidth == 0) { //
if (hRatio < 1) Ratio = hRatio;
} else if (maxHeight == 0) {
if (wRatio < 1) Ratio =wRatio;
} else if (wRatio < 1 || hRatio <1) {
Ratio = (wRatio <= hRatio ? wRatio : hRatio);
}
if (Ratio < 1) {
w = w * Ratio;
h = h * Ratio;
}
objImg.height = h;
objImg.width = w;
}
</script>
<td>
<ahref="
www.baidu.com"title="baidu">
<imgsrc="images/f.jpg" onload='AutoResizeImage(180,180,this)' border="0"/>
</a>
</td>
这是根据图片自设高度,你根据自己的需求改下,就行