var iframe = document.createElement("iframe");
iframe.src = "http://www.jb51.net";

if (!/*@[email protected]*/0) { //if not IE
iframe.onload = function(){
alert("Local iframe is now loaded.");
};
} else {
iframe.onreadystatechange = function(){
if (iframe.readyState == "complete"){
alert("Local iframe is now loaded.");
}
};
}
document.body.appendChild(iframe); 
 

var iframe = document.createElement("iframe");
iframe.src = "http://sc.jb51.net";
if (iframe.attachEvent){
iframe.attachEvent("onload", function(){
alert("Local iframe is now loaded.");
});
} else {
iframe.onload = function(){
alert("Local iframe is now loaded.");
};
}
document.body.appendChild(iframe);