if (screen.width==800||screen.height==600) //if 800x600
window.location.replace("index_chromeless.htm")

else if (screen.width==1280||screen.height==1024) //if 1280x1024
window.location.replace("index_chromeless_1280.htm")

else if (screen.width==1024||screen.height==768) //if 1024x768
window.location.replace("index_chromeless_1024.htm")

else if (screen.width==1600||screen.height==1024) //if 1600x1024
window.location.replace("index_chromeless_1600.htm")

else //if all else
window.location.replace("index_chromeless.htm")