Failed to load a java applet to safari5.1(windows 7)--prompt "missing plug-in"(i have installed JAVA JRE), but succeed in IE and Chrome.

Question

I suspect this is a minor code error issue.
The html code like below, do i need to add other parameter for Safari 5.1 ?  And is there any other method to load applet in Safari? thanks.
system is Windows 7, browser version is Safari 5.1 for windows.
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<!--[if !IE]> Firefox and others will use outer object --> 
<object classid="java:com.keithley.SCPI.SCPIApplet.class" type="application/x-java-applet;version=1.6" archive="../jar/SCPI.jar" height="480" width="640">
<param name = "scriptable"   value = "true">
<!-- Konqueror browser needs the following param -->
<param name = "ARCHIVE"    value = "../jar/SCPI.jar">
         <!-- (Microsoft Internet Explorer) will use inner object -->
         <object classid="clsid:8AD9C840-044E-11D1-B3E9-00805F499D93"codebase="http://java.sun.com/update/1.6.0/jinstall-6u35-windows-i586.cab#Version=6,0,0,10"
                 height="480" width="640" >
                 <param name = "CODE"       value = "com.keithley.SCPI.SCPIApplet.class">
                 <param name = "ARCHIVE"    value = "../jar/SCPI.jar">
                 <param name = "type"       value = "application/x-java-applet;version=1.6">
                 <param name = "scriptable" value = "false">
          </object>
           <!--[if !IE]> close outer object -->
</object>

Answer 1

Does the Safari5.1 in Windows7 use its own java plug-in instead of SUN's?