modificati questo qui

<applet code = "ZCalendar.class" archive="zCalendar.jar" width = "150" height= "22">
<param name="button_color" value="0,0,255"></param>
<param name="arrow_color" value="255,255,0"></param>
<param name="text_color" value="255,255,255"></param>
<param name="text" value="Calendar"></param>
</applet>