function checkRes(){
	if(screen.width == 800){
		document.body.style.backgroundImage = 'url(images/bg_800.jpg)';
	}
	if(screen.width == 1024){
		document.body.style.backgroundImage = 'url(images/bg_1024.jpg)';
	}
	if(screen.width == 1200){
		document.body.style.backgroundImage = 'url(images/bg_1280.jpg)';
	}

	if(screen.width == 1280){
		document.body.style.backgroundImage = 'url(images/bg_1280.jpg)';
	}
	if(screen.width == 1440){
		document.body.style.backgroundImage = 'url(images/bg_1440.jpg)';
	}	if(screen.width == 1600){
		document.body.style.backgroundImage = 'url(images/bg_1600.jpg)';
	}
	if(screen.width == 1680){
		document.body.style.backgroundImage = 'url(images/bg_1680.jpg)';
	}if(screen.width == 1920){
		document.body.style.backgroundImage = 'url(images/bg_1920.jpg)';
	}
}