function copyToClipboard(txt) {
    if (window.clipboardData) {
        window.clipboardData.clearData();
        window.clipboardData.setData("Text", txt);
    } else if (navigator.userAgent.indexOf("Opera") != -1) {
    //window.location = txt;
    alert("Your browser does not support this HANDY COPY.\nPlease use \"Ctrl +C\" or your right mouse button.");
    return false;
    } else if (window.netscape) {
        try {
            netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
        } catch (e) {
            //alert("is your browser to refuse! \ n in the browser address bar type 'about: config' and carriage return \ n and then 'signed.applets.codebase_principal_support' set to 'true'");
            //alert("您使用的浏览器不支持此复制功能, 请使用Ctrl+C或鼠标右键.");
            alert("Your browser does not support this HANDY COPY.\nPlease use \"Ctrl +C\" or your right mouse button.");
            return false;
        }
        var clip = Components.classes['@mozilla.org/widget/clipboard;1'].createInstance(Components.interfaces.nsIClipboard);
        if (!clip)
            return false;
        var trans = Components.classes['@mozilla.org/widget/transferable;1'].createInstance(Components.interfaces.nsITransferable);
        if (!trans)
            return false;
        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);
    }
    alert("Copy success");
    return true;
}
function IsURL(str_url){
  var strRegex = "^ *(((https)|(http)|(ftp)|(rtsp)|(mms)) *: *//)?"
        + "([^ :/@\\?#]+@)?"
        + "((([0-9]{1,3}\\.){3}[0-9]{1,3})|(([^ :/@\\?#]+\\.)+[a-zA-Z]{2,6}))"
        + "(:[0-9]{1,4})?"
        + "(/[^ /]*)*(\\?[^ \\?]*)*(#[^ #]*)? *$";
        var re=new RegExp(strRegex);
        if (re.test(str_url)){
            return true;
        }else{
            return false;
        }
    }