Musisz zmienić docelowy czas(90) i stronę do której ma wrócić 

 
Stoper

      Tam gdzie oczekujesz powyższego efektu wstaw:

         SCRIPT LANGUAGE="JavaScript"><br /> /*<br /> For this script<br /> Visit http://java-scripts.net <br /> or http://wsabstract.com<br /> */</p> <p align="left">var ms = 0;<br /> var state = 0;</p> <p align="left">function startstop() {<br /> if (state == 0) {<br /> state = 1;<br /> then = new Date();<br /> then.setTime(then.getTime() - ms);<br /> } else {<br /> state = 0;<br /> now = new Date();<br /> ms = now.getTime() - then.getTime();<br /> document.stpw.time.value = ms;<br /> }<br /> }</p> <p align="left">function swreset() {<br /> state = 0;<br /> ms = 0;<br /> document.stpw.time.value = ms;<br /> }</p> <p align="left">function display() {<br /> setTimeout("display();", 50);<br /> if (state == 1) {now = new Date();<br /> ms = now.getTime() - then.getTime();<br /> document.stpw.time.value = ms;<br /> }<br /> }</p> <p align="left">window.onload=display<br /> </SCRIPT></p> <p align="left"><br /> <CENTER><br /> <FORM NAME="stpw"><br /> Time:<br /> <INPUT TYPE="text" Name="time"><br /> <INPUT TYPE="BUTTON" Name="ssbutton" VALUE="Start/Stop" onClick="startstop()"><br /> <INPUT TYPE="BUTTON" NAME="reset" VALUE="Reset" onClick="swreset()"><br /> </FORM><br /> </CENTER></p></body></html>

Prosty Zegar 

Wystarczy, że w kodzie swojej strony wstawisz:

ZEGAR 2

Wklej w BODY strony:

W tagu BODY dodaj parametr: onLoad="show5()"