if (screen.width==800||screen.height==600) //if 800x600
window.location.replace("index_global.htm")
else if (screen.width==1280||screen.height==1024) //if 1280x1024
window.location.replace("index_1280.htm")
else if (screen.width==1024||screen.height==768) //if 1024x768
window.location.replace("index_1024.htm")
else //if all else
window.location.replace("index_global.htm")