Java 3d applet and HTML

Hi, I'm trying to pass an .obj file name into a java 3d applet but it just doesn't want to work for me! The code in the applet is as follows:
/**********************************************/
String ModelName;
...
...
...
public void init() {
ModelName = getParameter("MODELNAME");
if (filename == null) {
try {
URL path = getCodeBase();
filename = new URL(path.toString() + ModelName);
}
catch (MalformedURLException e) {
System.err.println(e);
System.exit(1);
}
}
/**********************************************/
The HTML is as follows:
/***********************************************/
<Object classid="clsid:8AD9C840-044E-11D1-B3E9-00805F499D93" WIDTH = 400 HEIGHT = 400 ALIGN = "center" >
<PARAM NAME = ModelName VALUE = "Model.obj" >
<EMBED type="application/x-java-applet;version=1.2.2" CODE = "Model.class" WIDTH = 400 HEIGHT = 400 ALIGN = "center" scriptable=false pluginspage="http://java.sun.com/products/plugin/1.3/plugin-install.html"></embed><NOEMBED>
</NOEMBED>
</Object>
/***********************************************/
Any suggestions would be greatly appreciated - thanks

"Hel Bel"
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