Update two iframes
<html> <head> <script type="text/javascript"> function twoframes(){ document.getElementById("frame1").src="http://www.java2s.com" document.getElementById("frame2").src="http://www.java2s.com" } </script> </head> <body> <iframe src="http://www.java2s.com" id="frame1"></iframe> <iframe src="http://www.java2s.com" id="frame2"></iframe> <br> <form> <input type="button" onclick="twoframes()" value="Change url of the two iframes"> </form> </body> </html>