一个用Javascr ipt控制的vrml场景，可以通过拖动进度条调节天空和地面的颜色，效果十分的好，利于初学者学习研究。-The control of a vrml scene with Javascr ipt, you can drag the progress bar adjust the color of the sky and ground, the effect is very good, which will help beginners to study and research

高效拖动控件 ，Javascr ipt 来写 拖动效果非学好，不会走位， 用SetTimer 来更新，不是用MouseMove 来更新， 时间可以自已设定 有定位记录效果，可以用在多功能网站，效果没得说-A Good Drag Control， Whitch is write by Javascr ipt, the Screen fresh Click in Timer, About 20times a second it also can set your