javascript实现图片预览

<input name="w_s" type="file" id="w_s" onChange="load_img(this.value,img_s);">
<input name="w_b" type="file" id="w_b" onChange="load_img(this.value,img_b);">
<div id="img_s"></div>
<div id="img_b"></div>

<script language="javascript">
<!--