<iframe id="ifa" style="display:none" />

<img src="***.jpg" />

<img data-type="loadimg" data-src="***.jpg" />

<script type='text/javascript'>

        var imgs=document.getElementsByTagName('img');

        var newimgarr=[];

        for(var i=0;i<imgs.length;i++){

            var g=imgs[i];

            if(g.getAttribute('data-type')=='loadimg'){

                newimgarr.push(g);

            }

        }

        var i=document.getElementById('ifa');

        var w=i.contentWindow;

        for(var j=0;j<newimgarr.length;j++){

            var k=newimgarr[j];

            (function(k){

                var imgurl=k.getAttribute('data-srcc');

                getImg(w.document,imgurl,function(){

                    k.src=imgurl;

                });

            })(k);

        }

        function getImg(doc,src,callback){

            var img=doc.createElement('img');

            img.src=src;

            img.onload=callback;

        }

    </script>