CZML Billboard image using URL

I’m having trouble producing a valid CZML file using an image hosted on a server via a known URL. Anyone have a working example of this?

I’d like to be able to use something like this modified Snippet from the simple.czml example on the Sandcastle page.

Original CZML with embedded/encoded image:

{
“id”:“Facility/AGI”,
“name”:“AGI”,
“availability”:“2012-03-15T10:00:00Z/2012-03-16T10:00:00Z”,
“description”:"\r\n

\r\nAnalytical Graphics, Inc. (AGI) develops commercial modeling and analysis software used by more than 40,000 global space, defense and intelligence professionals. AGI founded Cesium to meet the need for a cross-platform virtual globe with dynamic-data visualization. AGI continues to invest heavily in Cesium’s development and facilitate the growth of the user and contributor community.\r\n

",
“billboard”:{
“eyeOffset”:{
“cartesian”:[
0,0,0
]
},
“horizontalOrigin”:“CENTER”,
“image”:“data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAACvSURBVDhPrZDRDcMgDAU9GqN0lIzijw6SUbJJygUeNQgSqepJTyHG91LVVpwDdfxM3T9TSl1EXZvDwii471fivK73cBFFQNTT/d2KoGpfGOpSIkhUpgUMxq9DFEsWv4IXhlyCnhBFnZcFEEuYqbiUlNwWgMTdrZ3JbQFoEVG53rd8ztG9aPJMnBUQf/VFraBJeWnLS0RfjbKyLJA8FkT5seDYS1Qwyv8t0B/5C2ZmH2/eTGNNBgMmAAAAAElFTkSuQmCC”,
“pixelOffset”:{
“cartesian2”:[
0,0
]
},

.

.

.

Desired variation:

{
“id”:“Facility/AGI”,
“name”:“AGI”,
“availability”:“2012-03-15T10:00:00Z/2012-03-16T10:00:00Z”,
“description”:"\r\n

\r\nAnalytical Graphics, Inc. (AGI) develops commercial modeling and analysis software used by more than 40,000 global space, defense and intelligence professionals. AGI founded Cesium to meet the need for a cross-platform virtual globe with dynamic-data visualization. AGI continues to invest heavily in Cesium’s development and facilitate the growth of the user and contributor community.\r\n

",
“billboard”:{
“eyeOffset”:{
“cartesian”:[
0,0,0
]
},
“horizontalOrigin”:“CENTER”,
“image”:“http://servername.domain/image_filename.image_format_extension”,
“pixelOffset”:{
“cartesian2”:[
0,0
]
},

.

.

.

This is probably a CORS issue. Are you seeing any security error messages in your browsers console?