Código HTML:
<script language="javascript" type="text/javascript"> <!-- This script and many more are available free online at --> <!-- The JavaScript Source!! [url]http://javascript.internet.com[/url] --> function shake_xy(n) { if (self.moveBy) { for (i = 10; i > 0; i--) { for (j = n; j > 0; j--) { self.moveBy(0,i); self.moveBy(i,0); self.moveBy(0,-i); self.moveBy(-i,0); } } } } function shake_x(n) { if (self.moveBy) { for (i = 10; i > 0; i--) { for (j = n; j > 0; j--) { self.moveBy(i,0); self.moveBy(-i,0); } } } } function shake_y(n) { if (self.moveBy) { for (i = 10; i > 0; i--) { for (j = n; j > 0; j--) { self.moveBy(0,i); self.moveBy(0,-i); } } } } //--> </script> <!-- y e l en lace pude ser boton o <a>---> <a href="javascript:shake_xy(3)">Sacudir pantalla</a> o <input type=button value="Sacudir pantalla" onclick="shake_x(4)">