在一张网页中同时播放四个视频，且仅有一个播放控制按钮，四个视频能实现同步播放。用时加入四个同步视频并分别更名为：full.wmv，student.wmv,teacher.wmv,vga.wmv-While playing a video in a web page four, and only one player control buttons, four video can be synchronized playback. When joined with four simultaneou