function set_copy(_sTxt){
try{
if(window.clipboardData) {
    window.clipboardData.setData("Text", _sTxt);
} else if(window.netscape) {
    netscape.security.PrivilegeManager.enablePrivilege('UniversalXPConnect');
    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 = _sTxt;
    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);
}
}catch(e){}
}