记下你选择的图片的参数,然后用
var img = document.getElementById("image1");
img.height=200;
img.width=104;
<img SRC="E:\jspdev\img\13457s.jpg" id="image1">
var img = document.getElementById("image1");
img.height=200;
img.width=104;
<img SRC="E:\jspdev\img\13457s.jpg" id="image1">
img.height=200;
img.width=104;
img.src="E:\\jspdev\\img\\13848s.jpg";
<img SRC="E:\jspdev\img\13457s.jpg" id="image1">
<option value=1>image1</option>
<option value=2>image2</option>
<option value=3>image3</option>
</select>
<img src="1.gif" width=32 height=32 name="showimg">