IE6/7下多种方法移除button、input 默认边框和去掉焦

<div class="wrap">
<input type="text" class="input_txt">
<input type="submit" value="submit" class="input_btn">
<input type="button" value="提交" class="input_btn">
<div>

<style type="text/css">
input{margin:0;padding:0;}
.wrap{background-color:#0f0;}
.input_txt,.input_btn{border:0 none;}
</style>

<!--[if IE]>
<style type="text/css">
input{margin:0;padding:0;filter:chroma(color=#000000);border:none; }
.wrap{background-color:#0f0;}
</style>
<![endif]-->

<style type="text/css">
a:focus, :focus {noFocusLine: expression(this.onFocus=this.blur());}
</style>