Pon este codigo donde quieras que se vea el recuadro:
<applet code="HispanoChat.class" align="middle" width="291" height="228"
archive="/HispanoChat.jar" style="font-family: Verdana; font-size: 8pt; font-weight: bold">
<param name="code" value="HispanoChat.class">
<param name="codeBase" value="http://www.irc-hispano.org/demochat/">
<param name="archive" value="HispanoChat.jar">
<param name="Server" value="www.irc-hispano.org">
<param name="NodeName" value="">
<param name="Nick" value="">
<param name="Password" value="">
<param name="Ident" value="ident">
<param name="Info" value="">
<param name="AutoStart" value="OFF">
<param name="BackColor" value="cccccc">
<param name="Canal" value="#TU_CANAL">
<param name="Restricted" value="OFF">
<param name="DarkMode" value="OFF">
<param name="FontFace" value="Verdana">
<param name="Conference" value="OFF">
<param name="QuitMessage" value="bye">
<param name="OldIdent" value="ON">
<param name="LongTime" value="ON">
<param name="WidgetBackColor" value="cfcfcf">
<param name="WidgetForeColor" value="00000000">
<param name="ForeColor" value="00000000">
<param name="ButtonBackColor" value="cfcfcf">
<param name="ButtonForeColor" value="00000000">
<param name="strNick" value="Nick:">
<param name="strPasswd" value="Password:">
<param name="strEmail" value="Email:">
<param name="strChannel" value="Canal:">
<param name="strConnect" value="¡¡Conectar!!">
<param name="strApply" value="Aplicar">
<param name="strChangeNick" value="Nuevo Nick:">
<param name="strChannel" value="Canal:">
<param name="strColor" value="Color Fondo:">
<param name="strColorDay" value="Blanco">
<param name="strColorNight" value="Negro">
<param name="strConnect" value="Conectar">
<param name="strDisconnect" value="Desconectar">
<param name="strEmail" value="Email:">
<param name="strFont" value="Fuente:">
<param name="strMode" value="EL Modo:">
<param name="strModeConference" value="Conferencia">
<param name="strModeIRC" value="Irc">
<param name="strNick" value="Nick:">
<param name="strPasswd" value="Password:">
<param name="TabNotTextColor" value="FFFFFF">
<param name="TabSuperNotTextColor" value="FFFFFF">
<param name="TabTextColor" value="FFFFFF">
<param name="FontSize" value="14">
</applet>