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Editable iframe double-click not working in Opera and Firefox
<html>
<head>
<script type="text/javascript">
var iframeWin;
function iFrameOn(){
    iframe1=document.getElementById("iframe1").contentWindow;
    iframe1.document.designMode = 'On';
}
function html(){
    iframeWin = document.getElementById("iframe1").contentWindow;
    iframeWin.document.ondblclick = dblClicked;
}
function dblClicked(evt) {
    evt = evt || iframeWin.event;
    var target = evt.target || evt.srcElement;
    if(target.tagName=="IMG"){
        alert("Name: " + target.tagName + "; Src: " + target.src + "; Width: " + target.width + "; Height: " + target.height + ";");
    } else {
        alert(target.tagName);
    }
}
</script>
</head>
<body onload="iFrameOn()">
<iframe name="iframe1" id="iframe1" onload="this.contentWindow.document.ondblclick=html;"></iframe>
</body>
</html>