// JavaScript Document

	x = screen.width;
	if(x > 1920) {
		document.writeln( '<img id="backimage" class="backgroundimage" src="PC_site/pic/night17b.jpg" />' ); 
	}
	else {
		document.writeln( '<img id="backimage" class="backgroundimage" src="PC_site/pic/night17.jpg" />' ); 
	}