Coding Needed For Online Research Study

Hello, I am currently coding an online psychological study and am in need of some help in coding some of it. Part of the study includes a gender discrimination task (the participant is shown a picture of a man or woman and must indicate which they think it is in a set time), but I am unsure of the best way to go about this. Each image is presented for 2 seconds, after which participants have 3 seconds to make a decision. Previously I have used flash for image presentation as it allowed for good control of presentation time, but I am not sure how to integrate a time linked response to each image using this method so I am happy to go with something else (PHP/MySQL has been suggested to me by others). To summarise, what I am looking for is something that allows: A timed presentation of a series of still images. A way to record responses (either through keystrokes or button presses) And a way to link which response corresponds to which picture.