Hello Umbraco people

I got a problem with a macro. the macro should just give back a iframe with the link the user past in, the marco can be put into the Rich Text editor.

when I make the url to an external site it just loads forever like nothing happend but if I save the page it will show on the page normaly is there maybe a fix for this, because the user whould think it hasent loaded yet.

Image of how it looks if its an external link, the load symbol will just continue forever. http://gyazo.com/4b50dd9faec8310234e075d7ac5e0cef.png

This is the macro code just simple get the string that the user input and then make a <div> and <iframe> tag around.

@inherits Umbraco.Web.Macros.PartialViewMacroPage
@*
   Macro parameter to be set on the macro
   Show:True   Alias:iframeUrl     Name:Iframe Url    Type:Textstring
*@   

@{ 
    var iframeUrl = Model.MacroParameters["iframeUrl"];
}


@if(!iframeUrl.Equals(""))
{
    <div class="iframe">
        <iframe src="@iframeUrl" height="100%" width="100%">
        </iframe>
    </div>
}