Падающий мячик

Скрипт: Падающий мячик
<html> <head> <title>Падающий мячик</title> <script language="JavaScript"> function checkBrowser() { var name = navigator.appName; if (name == "Netscape") this.name = "NS"; else if (name == "Microsoft Internet Explorer") this.name = "IE"; // Если запущен Firefox, то используем новую переменную this.NS = (this.name == "NS"); } is = new checkBrowser(); </script> </head> <body> <h1>Падающий мячик</h1> <center> <p>Щелкните в любом месте страницы для запуска сценария <br> <div id="staticBall" style="position:relative;visibility:visible"> <img src="ball.gif" height=30 width=30> </div> </center> <div id="ball" style="visibility:hidden; position:absolute; left:100; top:10; height:34; width:34"> <img src="ball.gif" height=30 width=30> </div> <script language="Javascript"> iter = 0; setId = 0; down = true; up = false; bouncingBall = document.getElementById("ball").style; stillBall = document.getElementById("staticBall").style; winH = (is.NS) ? window.innerHeight - 55 : document.body.offsetHeight - 55; document.onmouseup = buttonUp; function buttonUp(e) { if ( ((is.NS) ? e.which : event.button) != 1) return true; if (setId != 0) clearInterval(setId); bouncingBall.visibility="visible"; stillBall.visibility="hidden"; bouncingBall.left = (is.NS) ? e.pageX - 15 : event.offsetX - 15; bouncingBall.top = (is.NS) ? e.pageY - 15 : event.offsetY - 15; iter = 0; setId = setInterval("generateGravity()", 20); return true; } function generateGravity() { if ((parseInt(bouncingBall.top)+iter < winH) && down) { bouncingBall.top = parseInt(bouncingBall.top) + iter; iter++; return; } else { if ((parseInt(bouncingBall.top)< winH) && down) { bouncingBall.top = winH + 5; return; } down = false; up = true; if (iter < 0 && parseInt(bouncingBall.top) > winH) { clearInterval(setId); bouncingBall.visibility = "hidden"; stillBall.visibility="visible"; setId = 0; } if (parseInt(bouncingBall.top) > 0 && up && iter >= 0) { bouncingBall.top = parseInt(bouncingBall.top) - iter; iter--; if (iter%3 == 0) iter--; return; } down = true; up = false; } } </script> <p><center> <font face="arial, helvetica" size="-2">Free JavaScripts provided<br> by <a href="http://javascriptsource.com">The JavaScript Source</a></font> </center><p> <div align="center"><a href="http://www.ucoz.ru/" title="Создать сайт бесплатно"><img style="margin:0;padding:0;border:0;" alt="Hosted by uCoz" src="http://s204.ucoz.net/img/cp/9.gif" width="80" height="15" title="Hosted by uCoz" /></a><br /></div> </body> </html>

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