This is probably the simpliest Button JavaScript. Copy 4 lines of HTML into your document and you have a button alert! The button can have different words on it and the message can also be customized.
JavaScript Source Code 3000: Buttons: Alert Button Simply click inside the window below, use your cursor to highlight the script, and copy (type Control-c or Apple-c) the script into a new file in your text editor (such as Note Pad or Simple Text) and save (Control-s or Apple-s). The script is yours!!!
<!-- ONE STEP TO INSTALL ALERT BUTTON:
1. Paste the coding into the BODY of the HTML document -->
<!-- STEP ONE: Copy this code into the BODY of your HTML document -->
<BODY>
<CENTER> <FORM>
<! > <! >
<INPUT TYPE="button" VALUE="Click here to be alerted" onClick='alert("There. You have been alerted.")'> </FORM> </CENTER>