mPulse JavaScript example

(function(){
    if (window.BOOMR && window.BOOMR.version) { return; }
    var dom,doc,where,iframe = document.createElement('iframe');
    iframe.src = "javascript:false";
    (iframe.frameElement || iframe).style.cssText = 
    "width: 0; height: 0; border: 0; display: none;";
    where = document.getElementsByTagName('script')[0];
    where.parentNode.insertBefore(iframe, where);

    try {
        doc = iframe.contentWindow.document;
    } catch(e) {
        dom = document.domain;
        iframe.src="javascript:var d=document.open();d.domain='"+dom+"';void(0);"
        doc = iframe.contentWindow.document;
    }
    doc.open()._l = function() {
        var js = this.createElement("script");
        if(dom) this.domain = dom;
        js.id = "boomr-if-as";
        js.src = '//c.go-mpulse.net/boomerang/API_KEY';
        BOOMR_lstart=new Date().getTime();
        this.body.appendChild(js);
    };
    doc.write('<body onLoad="document._l();">');
    doc.close();
})();