Untitled

<html>
<body>
    <div class="pagewrapper">
        <div class="page">
            <iframe id="TabContentIframe" src="/MyTestWebsite4/TabContent/Details/8"></iframe>
            <iframe id="TabContentIframe" src="/MyTestWebsite4/TabContent/Details/8"></iframe>
            <iframe id="TabContentIframe" src="/MyTestWebsite4/TabContent/Details/8"></iframe>
        </div>
    </div>
</body>
</html>

<html>
<body>
    <div class="pagewrapper">
        <div class="DivIWant">
            <iframe id="MainContentIframe" src="/MyTestWebsite4/MainContent/Details/8"></iframe>
        </div>
    </div>
</body>
</html>

<html>
<body>
    <div class="pagewrapper">
        <div iD = "BtnIPressed">
        </div>
    </div>
</body>
</html>

alert(parent.parent.getElementById("DivIWant").innerHTML)

alert(parent.getElementById("DivIWant").innerHTML)

var par = null;
var div = null;
while(par!==window){
    par = par.parent;
    var div = par.getElementById("DivIWant")
    if(div){
         break;
    }
}
if(div){
    alert(div.innerHTML);
}

window.top.document.getElementById("DivIWant");