导航框架的使用
frame.html的代码：
<html> <frameset cols="25%,*"> <frame src="left.html" /> <frame src="right.html" [color=red]name="showframe"[/color] /> </frameset></html>
<html><head></head><body ><center>MyShopping</center><br><center><a href="home.html" target="showframe">Home Page</a></center><br><center><a href="login.html" target="showframe">User Login</a></center><br><center><a href="register.html" target="showframe">User Register</a></center><br></body></html>
