var height=0; 
var width=0; 
width = 0;
if (self.screen) {     // for NN4 and IE4 
        width = screen.width 
        height = screen.height 
} 
else if (self.java) {   // for NN3 with enabled Java 
       var jkit = java.awt.Toolkit.getDefaultToolkit(); 
       var scrsize = jkit.getScreenSize();        
       width = scrsize.width; 
       height = scrsize.height; 
} 
if (width >= 1024) {
a = '<img border="0" src="/screen/screen.asp?ScreenWidth=1024" alt="" width="1" height="1" />';
} else {
a = '<img border="0" src="/screen/screen.asp?ScreenWidth=800" alt="" width="1" height="1" />';
}