Buttons

[mortalc]

How can I use a button in Javascript?I just need it to do 2 mathematical operations on click.

[Synook]

Set the onclick handler of the "button" (it doesn't have to be a <button>) to run your function.

document.getElementById("button").onclick = function() {	do_maths();}

[chibineku]

Bind the onclick event of the button to a function, which can be done most easily in the button element:<input type="button" onclick="myFunction()" />And then in myFunction() you can do whatever you want to do.Edit: or attach the handler in script as Synook demonstrated, which is considered best practice anyway