The following functions are useful when you need to add a button to a web page:
The addButton function writes the HTML to render a WebCenter-style button in a web page.
addButton(text,url,tooltip)
addButton(Previous message, prevMsg.esp,Get the message immediately prior to this one);
Returns a string containing the HTML for a standard button, but does not render the button.
getButton(url, text, tooltip)
document.write("[assign the value for TD in your book]" + getButton(MY_URL, "History graph") + "</td>");