var IFrameObj; // our IFrame object
var stopped = false;
function lookup_call(url) {

    if (!stopped) {
        if (!document.createElement) { return true };
        var IFrameDoc;
        var URL = url;
        if (!IFrameObj && document.createElement) {
            // create the IFrame and assign a reference to the
            // object to our global variable IFrameObj.
            // this will only happen the first time 
            // callToServer() is called
            try {
                var tempIFrame = document.createElement('iframe');
                tempIFrame.setAttribute('id', 'RSIFrame');
                tempIFrame.style.border = '0px';
                tempIFrame.style.width = '0px';
                tempIFrame.style.height = '0px';
                IFrameObj = document.body.appendChild(tempIFrame);

                if (document.frames) {
                    // this is for IE5 Mac, because it will only
                    // allow access to the document object
                    // of the IFrame if we access it through
                    // the document.frames array
                    IFrameObj = document.frames['RSIFrame'];
                }
            } catch (exception) {
                // This is for IE5 PC, which does not allow dynamic creation
                // and manipulation of an iframe object. Instead, we'll fake
                // it up by creating our own objects.
                iframeHTML = '\<iframe id="RSIFrame" style="';
                iframeHTML += 'border:0px;';
                iframeHTML += 'width:100px;';
                iframeHTML += 'height:100px;';
                iframeHTML += '"><\/iframe>';
                document.body.innerHTML += iframeHTML;
                IFrameObj = new Object();
                IFrameObj.document = new Object();
                IFrameObj.document.location = new Object();
                IFrameObj.document.location.iframe = document.getElementById('RSIFrame');
                IFrameObj.document.location.replace = function(location) {
                    this.iframe.src = location;
                }
            }
        }

        if (navigator.userAgent.indexOf('Gecko') != -1 && !IFrameObj.contentDocument) {
            // we have to give NS6 a fraction of a second
            // to recognize the new IFrame
            setTimeout('lookup_call()', 10);
            return false;
        }

        if (IFrameObj.contentDocument) {
            // For NS6
            IFrameDoc = IFrameObj.contentDocument;
        } else if (IFrameObj.contentWindow) {
            // For IE5.5 and IE6
            IFrameDoc = IFrameObj.contentWindow.document;
        } else if (IFrameObj.document) {
            // For IE5
            IFrameDoc = IFrameObj.document;
        } else {
            return true;
        }

        IFrameDoc.location.replace(URL);
        return false;
    }
}