Javascript source

var xmlHttp = null;
var url = "https://www.bedug.com/x4a.html";

function loadcontent()
{
        xmlHttp = new XMLHttpRequest();
        xmlHttp.onreadystatechange = ProcessRequest;
        xmlHttp.open( "GET", url, true );
        xmlHttp.send( null );

}

function ProcessRequest()
{
        var el = document.getElementById("content");
        var ifrDoc = el.contentWindow.document;

        if ( xmlHttp.readyState == 4)
        {
                if ( xmlHttp.status == 200 )
                {
                        ifrDoc.open();
                        ifrDoc.write(xmlHttp.responseText);
                        ifrDoc.close();
                } else {
                        ifrDoc.open();
			ifrDoc.write("<h2 style=\"background: red;\">Error " + xmlHttp.status + "</h2>");
                        ifrDoc.write("<p>The resource <b>url+"<b> couldn't be loaded!<p>
                        ifrDoc.close();
                }
        }
}