回来按钮===等同于IE后退功能

<script language="javascript"> 
function goback() 
{ 
history.back(); 
//或者如下 
//history.go(-1); 
}   
</script>

<input id="Button1" style="color: #0000ff; text-decoration: underline" type="button" value="返回" onclick="goback()" />