html file 表单样式(css过滤器实现)

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<input type=‘text‘ name=‘textfield‘ id=‘textfield‘ class=‘txt‘ /> 
<input type=‘button‘ class=‘btn‘ value=‘浏览...‘ /> 
<input type="file" name="fileField" class="file" id="fileField" size="28" onchange="document.getElementById(‘textfield‘).value=this.value" /> 
<input type="submit" name="submit" class="btn" value="上传" /> 
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css样式
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.file-box{ position:relative;width:340px} 
.txt{ height:22px; border:1px solid #cdcdcd; width:180px;} 
.btn{ background-color:#FFF; border:1px solid #CDCDCD;height:24px; width:70px;} 
.file{ position:absolute; top:0; right:80px; height:24px; filter:alpha(opacity:0);opacity: 0;width:260px } 
...