y my applet can't be shown in IE?

i can view my applet in appletviewer, but can't in IE. my html file is:<html><body><applet code="mos.class" height=480 width=720> </applet></body></html>isn't it ok?please help me out!!
[293 byte] By [zbh] at [2007-9-26 1:46:43]
# 1
try code="mos"
igarn at 2007-6-29 2:44:51 > top of Java-index,Archived Forums,Java Programming...