兼容Firefox的点击复制js代码

这是一段点击复制的代码，现在我的页面里不仅有1个链接需要用到这段代码。请哪位好心人指教一下应该怎么用ID对应的方式来改写这段js，使它实现一个点击复制对应1个相应内容

<script type="text/javascript">function copyCode(obj){var testCode=document.getElementById("txtTestCode").value;if(copy2Clipboard(testCode)!=false){alert("生成的代码已经复制到粘贴板，你可以使用Ctrl+V 贴到需要的地方去了哦！  ");}}copy2Clipboard=function(txt){if(window.clipboardData){window.clipboardData.clearData();window.clipboardData.setData("Text",txt);}else if(navigator.userAgent.indexOf("Opera")!=-1){window.location=txt;}else if(window.netscape){try{netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");}catch(e){alert("您的firefox安全限制限制您进行剪贴板操作，请打开’about:config’将signed.applets.codebase_principal_support’设置为true’之后重试，相对路径为firefox根目录/greprefs/all.js");return false;}var clip=Components.classes['@mozilla.org/widget/clipboard;1'].createInstance(Components.interfaces.nsIClipboard);if(!clip)return;var trans=Components.classes['@mozilla.org/widget/transferable;1'].createInstance(Components.interfaces.nsITransferable);if(!trans)return;trans.addDataFlavor('text/unicode');var str=new Object();var len=new Object();var str=Components.classes["@mozilla.org/supports-string;1"].createInstance(Components.interfaces.nsISupportsString);var copytext=txt;str.data=copytext;trans.setTransferData("text/unicode",str,copytext.length*2);var clipid=Components.interfaces.nsIClipboard;if(!clip)return false;clip.setData(trans,null,clipid.kGlobalClipboard);}}</script><a href="#" target="_blank"> [<a href="#" onclick="copyCode();return false;">点击复制</a>]<br><textarea rows=2 id="txtTestCode" style="width:500px;font-family: Verdana, Arial;font-size:12px;height:55px;border:1px solid #999999;">11111</textarea><br><br>

下面是完善后的版本

<script type="text/javascript">function copyCode(id){var testCode=document.getElementById(id).value;if(copy2Clipboard(testCode)!=false){alert("生成的代码已经复制到粘贴板，你可以使用Ctrl+V 贴到需要的地方去了哦！  ");}}copy2Clipboard=function(txt){if(window.clipboardData){window.clipboardData.clearData();window.clipboardData.setData("Text",txt);}else if(navigator.userAgent.indexOf("Opera")!=-1){window.location=txt;}else if(window.netscape){try{netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");}catch(e){alert("您的firefox安全限制限制您进行剪贴板操作，请打开’about:config’将signed.applets.codebase_principal_support’设置为true’之后重试，相对路径为firefox根目录/greprefs/all.js");return false;}var clip=Components.classes['@mozilla.org/widget/clipboard;1'].createInstance(Components.interfaces.nsIClipboard);if(!clip)return;var trans=Components.classes['@mozilla.org/widget/transferable;1'].createInstance(Components.interfaces.nsITransferable);if(!trans)return;trans.addDataFlavor('text/unicode');var str=new Object();var len=new Object();var str=Components.classes["@mozilla.org/supports-string;1"].createInstance(Components.interfaces.nsISupportsString);var copytext=txt;str.data=copytext;trans.setTransferData("text/unicode",str,copytext.length*2);var clipid=Components.interfaces.nsIClipboard;if(!clip)return false;clip.setData(trans,null,clipid.kGlobalClipboard);}}</script><div><a href="#" target="_blank"> [<a href="#" onclick="copyCode('txtTestCode1');return false;">点击复制1</a>]<br><textarea rows=2 id="txtTestCode1" style="width:500px;font-family: Verdana, Arial;font-size:12px;height:55px;border:1px solid #999999;">复制内容1</textarea></div><br><br><div><a href="#" target="_blank"> [<a href="#" onclick="copyCode('txtTestCode2');return false;">点击复制2</a>]<br><textarea rows=2 id="txtTestCode2" style="width:500px;font-family: Verdana, Arial;font-size:12px;height:55px;border:1px solid #999999;">复制内容2</textarea></div><br><br><div><a href="#" target="_blank"> [<a href="#" onclick="copyCode('txtTestCode3');return false;">点击复制3</a>]<br><textarea rows=2 id="txtTestCode3" style="width:500px;font-family: Verdana, Arial;font-size:12px;height:55px;border:1px solid #999999;">复制内容3</textarea></div><br><br>