Changing button text onclick

Question

When I click on myButton1 button, I want the value to change to Close Curtain from Open Curtain.
HTML:

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Answer 1

It seems like there is just a simple typo error:

1. Remove the semicolon after change(), there should not be any in the function declaration.
2. Add a quote in front of the myButton1 declaration.

Corrected code:

...
function change()
{
    document.getElementById("myButton1").value="Close Curtain"; 
}

A faster and simpler solution would be to include the code in your button and use the keyword this to access the button.