Pass an optional argument while using the Arguments Object

Is it possible to use the argument object and still pass in a flag (Boolean)?  I need to have the flexibility of processing multiple possible arrays passed in and at the same time have an option flag passed when necessary. Is that possible and if so, how? So for an example I'd like to have the following type of functionality (there will always be at least one array passed in):
_dtmInsertStaticTags(arr1)
_dtmInsertStaticTags(arr1,arr2)
_dtmInsertStaticTags(arr1,flag)
_dtmInsertStaticTags(arr1,arr2,arr3,flag)
_dtmInsertStaticTags(arr1,arr2,arr3,arrN)
_dtmInsertStaticTags(arr1,arr2,arr3,arrN,flag)

function _dtmInsertStaticTags() {


    var sTags = [];
    for (var index = 0; index < arguments.length; index++) {
        sTags = sTags.concat(arguments[index]);
    }

    //routine to inject detokenized src values into container iframe
    var iframeTag = document.createElement("iframe");
    iframeTag.setAttribute("width", "1");
    iframeTag.setAttribute("height", "1");
    iframeTag.style.display = "none";
    iframeTag.style.border = "none";

    for (var i = 0; i < sTags.length; i++) {
        var imgTag = document.createElement("img");
        imgTag.src = sTags[i];
        iframeTag.appendChild(imgTag);
    }

    if (window.addEventListener) {
        window.addEventListener("load", function () { document.body.appendChild(iframeTag); }, false);
    } else {
        window.attachEvent("onload", function () { document.body.appendChild(iframeTag); });
    }
};

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