How to return data from json?

I have the following codes:

<script type='text/javascript'>
//<![CDATA[
var postLink = function(entry) {
for (var j = 0; j < entry.link.length; j++) {
if (entry.link[j].rel == 'alternate') {
var postURL = entry.link[j].href;
return postURL;
break;
}
}
};

var postTitle = function(entry) {
var postTitle = entry.title.$t;
return postTitle;
};

var postThumb = function(entry) {
var post_thumbs = entry.media$thumbnail;
var default_post_thumb = '
http://3.bp.blogspot.com/-c5t2eHNHs78/VIruuqQHQ4I/AAAAAAAAAkY/a0kiJ0lJk2k/s120/no-thumb.gif
';
 
if (post_thumbs == 'undefined') {
return default_post_thumb;
} else if (post_thumbs == '[object Object]') {
return post_thumbs.url.replace("default", "0");
} else {
return default_post_thumb;
}
};

var postCategory = function(entry) {

return postCategory;
};
 
function *callback1*(json) {
for (var i = 0; i < json.feed.entry.length; i++) {
var entry = json.feed.entry[i];
var item1 = '<div class="*STYLE1*"><a href="' + postLink(entry) + '"><img 
src="' + postThumb(entry).replace("/s72-c/", "/s350/") + '"/></a><h3 
class="post-title"><a href="' + postLink(entry) + '">' + postTitle(entry) + 
'</a></h3><p class="post-category">' + postCategory(entry) + '</p></div>';
document.write(item1);
}
}
//]]>
</script>

These are my main issues... 
1. returning the category?
2. adding support for third party images?

Thank you so much for your help!

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