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XMLHttp object error 'data not available'

saturation asked
Last Modified: 2012-05-05
I'm getting "the data necessary to complete this operation is not yet available" message when trying to use the xmlhttp object to get information.  I tried adding

if (xmlhttp.readyState == 4) {
process the data

and now it's not even running.  How can I fix this so that it only runs when the object is ready? Might I add that everything works fine without the if statement but I get that annoying popup message.
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