@Gobo
Try using a iframe to the target site and overlaying the target area and then social engineering to click the button. I presume the button is activated with a javascript event rather than a post or get action. You need to be able to provide content either stored or reflected in some form to conduct an attack.
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"People who say it cannot be done should not interrupt those who are doing it.";
labs : [
www.businessinfo.co.uk]
blog : [
www.thespanner.co.uk]
Hackvertor : [
hackvertor.co.uk]