HTML button

回上一頁：(Reference http://blog.roodo.com/brysonbo/archives/9559597.html)
<input name="Submit" type="button" id="Submit" onClick="javascript:history.back(1)" value="回一上頁">

呼叫 server 端 php：(Reference http://www.plus2net.com/html_tutorial/button-linking.php)
<input type=button onClick="location.href='./server_prog.php'" value='click here to run php'>