json error

[Duncan]

I am having trouble trying to get value from the following sample json

[{"released":"2007-06-29","posters":[{"image":{"type":"poster","size":"thumb","height":118,"width":92,"url":"http://cf2.imgobject.com/t/p/w92/gMg48r3zMz6HMez4ksNEeOcrVV1.jpg","id":"4ea680f32c058837cb00c499"}},{"image":{"type":"poster","size":"w154","height":197,"width":154,"url":"http://cf2.imgobject.com/t/p/w154/gMg48r3zMz6HMez4ksNEeOcrVV1.jpg","id":"4ea680f32c058837cb00c499"}},{"image":{"type":"poster","size":"cover","height":237,"width":185,"url":"http://cf2.imgobject.com/t/p/w185/gMg48r3zMz6HMez4ksNEeOcrVV1.jpg","id":"4ea680f32c058837cb00c499"}},{"image":{"type":"poster","size":"w342","height":439,"width":342,"url":"http://cf2.imgobject.com/t/p/w342/gMg48r3zMz6HMez4ksNEeOcrVV1.jpg","id":"4ea680f32c058837cb00c499"}},{"image":{"type":"poster","size":"mid","height":641,"width":500,"url":"http://cf2.imgobject.com/t/p/w500/gMg48r3zMz6HMez4ksNEeOcrVV1.jpg","id":"4ea680f32c058837cb00c499"}},{"image":{"type":"poster","size":"original","height":854,"width":666,"url":"http://cf2.imgobject.com/t/p/original/gMg48r3zMz6HMez4ksNEeOcrVV1.jpg","id":"4ea680f32c058837cb00c499"}}],"backdrops":[],"version":225,"last_modified_at":"2012-04-30 18:27:15 UTC"}]

How can I get the value of the "url" under "posters".  I thought this would work "posters[0].image.url" but it does not work....desperate for an answer.  Trying to meet contest deadline.

[Duncan]

I added

datatype: jsonp

and oddly enough that worked for a  minute and now its not working any more.....I dont understand.  Anyone have any suggestions?