Applet not running in browser?

What is the reason why an applet will be running in appletviewer but not in a browser???

Try out with this html file:
<script language="JavaScript">
function MyToolBar()"Login.html","LoginPage","toolbar=0,menubar=0,scrollbar=0,resizable=0,directories=0,width='110%',height='150%'");
<SCRIPT LANGUAGE="JavaScript"><!--
var info = navigator.userAgent; var ns = false;
var ie = (info.indexOf("MSIE") > 0 && info.indexOf("Win") > 0 && info.indexOf("Windows 3.1") < 0);
<COMMENT><SCRIPT LANGUAGE="JavaScript1.1"><!--
var ns = (navigator.appName.indexOf("Netscape") >= 0 && ((info.indexOf("Win") > 0 && info.indexOf("Win16") < 0 && java.lang.System.getProperty("os.version").indexOf("3.5") < 0) | | (info.indexOf("Sun") > 0) | | (_info.indexOf("Linux") > 0)));
<SCRIPT LANGUAGE="JavaScript"><!--
if (_ie == true) document.writeln('<Center><OBJECT classid="clsid:8AD9C840-044E-11D1-B3E9-00805F499D93" WIDTH = "100%" HEIGHT = "150%" codebase=",1,2,0"><NOEMBED><XMP>');
else if (_ns == true) document.writeln('<EMBED type="application/x-java-applet;version=1.1.2" java_CODE = "MyApplet.class" WIDTH = "110%" HEIGHT = "150%" pluginspage=""><NOEMBED><XMP>');
<APPLET CODE = "MyApplet.class" WIDTH = "110%" HEIGHT = "150%" ></XMP>
<PARAM NAME = CODE VALUE = "MyApplet.class" >
<APPLET CODE = "MyApplet.class" WIDTH = "110%" HEIGHT = "150%" >
Hope this will help you.
Developer Technical Support
Sun Microsystems Inc,

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    Hai Manu
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