var h=0;
var w=0;

if (self.screen) {     // for NN4 and IE4
        w = screen.width
        h = screen.height
}
else if (self.java) {   // for NN3 with enabled Java
       var jkit = java.awt.Toolkit.getDefaultToolkit();
       var scrsize = jkit.getScreenSize();       
       w = scrsize.width; 
       h = scrsize.height; 
}