请问如何实现屏蔽表单元素的功能?比如我单击一个radio时,另外一个file上传框就变灰无效?

请问如何实现屏蔽表单元素的功能?我用javascript的disable和visable属性好象不行。
比如我单击一个radio时,另外一个file文件上传框就变灰无效,而单击另一个radio时,就变为可用。
谢谢!!!
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try

1<form enctype="multipart/form-data">
2<input language="javascript" name="r1" onclick="this.form.file1.disabled = this.checked;" type="radio"/>disable   
3<input language="javascript" name="r1" onclick="this.form.file1.disabled = !this.checked;" type="radio"/>enable   
4<input name="file1" type="file"/>
5</form>
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