​x
 
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<!DOCTYPE html>
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<title>My Example</title>
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​
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<script>
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// Wait for DOM to load
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document.addEventListener("DOMContentLoaded", function(event) {
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​
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  // Put the button into a variable
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  var e = document.getElementById("go");
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  // Wait for user to click the button  
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  e.addEventListener("click", function() {
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      // Do the alert box
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      alert("Thanks... I feel much better now!");
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  }, false);
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});
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</script>
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​
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<!-- Replace '{action page}' with your own action page to support non-JavaScript users -->
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<form name="myForm" action="{action page}">
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  <input id="go" type="button" value="Click me">
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</form>