禁用按钮onclick，但启用另一个按钮

I have two different buttons on my page. I want them both to be enabled when the page loads, but when a user clicks one I would like to disable the other button. But if they click the other button, I would like that button to disabled as well while enabling the other disabled button. I have been able to disable the button onclick, but I'm having trouble getting the other button to re-enable . Here are the two buttons that I have on the page. They are not in a form, just on the page.I have two different buttons on my page. I want