Xajax 0.5.3 in Code Igniter 1.5.4

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Yes, this is very helpful. I was just starting to do webservices. I still quite don't understand exactly how the data is being passed around here. Not the webservice, but when xajax and jquery come into play. I've created a member model with some data and it still doesn't return my db values to fill the selectbox. Can you post an example on how I would use data from the websevice to fill a div or something with xajax and when the div gets click the data is refreshed? I hope this is not asking for too much. I've been using CI for roughly 1 year now and just recently joined this forum. The main thing that doesn't make sense in your example is how the params work. Thank you in advance, this is some neat stuff.