激活文本框

设计中,一个select框,一个文本框;我将以文本框设置为disabled,然后改变select的选项时将文本框激活,请问各位怎么实现啊!
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1<script language="javascript">   
2function dd()   
3{   
4form1.file1.disabled=false;   
5return;   
6}   
7</script>
1<form name="form1">
2<select onclick="return dd()">
3<option>dd   
4<option>ds   
5<option>s   
6</option></option></option></select>
7<input disabled="" name="file1" type="text"/>
8</form>

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1<input disabled="" id="btnSubmit" type="Submit" value="Submit Data"/>
1<input id="Email" readonly="" size="30" type="Text" value="UserName@com"/>
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