//if (screen.width>1280||screen.height>800){
//	document.getElementById("main").style.position = "absolute";
//	document.getElementById("main").style.left = "50%";
//	document.getElementById("main").style.top = "50%";
//	document.getElementById("main").style.marginLeft = "-483px";
//	document.getElementById("main").style.marginTop = "-330px";
//}