A piece of 'copy to clipboard' javascript code for multiple browsers_javascript skills

The code is as follows, no more nonsense, it is compatible with basically all mainstream browsers (IE, FF), and can be used in many places:
copyToClipboard = 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("Your firefox security restrictions restrict you from clipboard operations, please open 'about:config' and set signed.applets.codebase_principal_support' to true' before trying again");
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);
}
}