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<link rel="stylesheet" type="text/css" href="http://serverapi.arcgisonline.com/jsapi/arcgis/3.0/js/esri/dijit/css/Popup.css">
Hi Bill,
Note the line at the top of the HTML page for that sample, which includes some specific CSS for the popup. Have you definitely included that in your code:<link rel="stylesheet" type="text/css" href="http://serverapi.arcgisonline.com/jsapi/arcgis/3.0/js/esri/dijit/css/Popup.css">
Steve
The online sample gets a "popup.png" from http://help.arcgis.com/en/webapi/javascript/arcgis/demos/images/popup.png. The "popup.png" contains the close, minimize, next arrow, and etc icons.
When you put the sample onto your IIS, it tries to get the "popup.png" from http://<your server name>/images/popup.png. But because the image doesn't exist on your IIS, it returns NetworkError: 403 Not Found error.
So, please go ahead to download the "popup.png" and put it into your wwwroot/images folder. It shall fix the issue.