That should all be enabled by default. You can double check by clicking Safari in the file menu and then down to Preferences. Click the Security button at the top and make sure Accept Cookies is not set to never. Also make sure Enable JavaScript is checked here. You may want to try unchecking block Popup windows.
If all these options are already set there may be a problem with the html/javascript on the page. What is the web address of the page that's not working?
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enable cookies and java script
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