var screenW = 640, screenH = 480; 
if ((navigator.appName == "Netscape") && (parseInt(navigator.appVersion)==3) && (navigator.javaEnabled()))
{
var jToolkit = java.awt.Toolkit.getDefaultToolkit(); 
var jScreenSize = jToolkit.getScreenSize(); 
screenW = jScreenSize.width; 
screenH = jScreenSize.height; 
}
else
{
screenW = screen.width;
screenH = screen.height;
}
if(screenW<1279) {
document.getElementById("lamp").style.background="none";
}