给自己的程序也加了loading...(ajax?js)

PHP:


<script>
function xxx(){
document.body.innerHTML=div1.innerHTML;
}
</script>
<form name="form1" action="http://www.sohu.com"onsubmit="returnxxx()"> 
<input type="submit" name="submit" value="提交">
</form>
<div id="div1" style="display:none;">
<p> </p><p> </p><p> </p><p align=center>请稍候……</p>
</div>