function hidediv()
{
if ((screen.width == 800) && (screen.height == 600)){
	document.all['banner1'].style.visibility = 'hidden';
	document.all['banner1'].style.display= '';
}
if ((screen.width == 1024) && (screen.height == 768)){
	document.all['banner2'].style.visibility = 'hidden';
	document.all['banner2'].style.display= '';
}
if ((screen.width == 1280) && (screen.height == 1024)){
	document.all['banner2'].style.visibility = 'hidden';
	document.all['banner2'].style.display= '';
}
}