function setBg() {
	//ha kisebbegyenlo 1024
	if (screen.width <= 1024)
		hatterkep = "1024_768";
	
	//ha nagyobb 1024 de kisebb 1360
	if ((screen.width > 1024) && (screen.width < 1360)) {
		if (screen.height <= 800)
			hatterkep = "1280_800";
		else
			hatterkep = "1280_1024";
	}
	
	//ha nagyobbegyenlo 1360 de kisebb 1600
	if ((screen.width >= 1360) && (screen.width < 1600))
		hatterkep = "1440_900";
		
	//ha nagyobbegyenlo 1600 de kisebb 1920
	if ((screen.width >= 1600) && (screen.width < 1920))
		hatterkep = "1600_1200";
		
	//ha nagyobbegyenlo 1920
	if (screen.width >= 1920)
		hatterkep = "1920_1080";

	document.body.style.backgroundImage = "url(/wp-content/themes/skulls/images/bg_"+hatterkep+".jpg)";
}