Multiple buttons on a single slide each connecting to a different url

Using a trial version of Captivate 7.  I have a handful of slides where the customer wants to open different forms via url.  I tried using a button for each link, inserting the url and using the "enter" key for each of the multiple buttons.  Works fine with the mouse but for 508 folks who tab to the URL and hit the enter key ......... I get many instances where the incorrect url is activated.  Is there a way around this without assicning a different shortcut key for buttons where thare are more than one on a single slide?     Thanks