window.onresize = function() { positioning(); }
window.onload = function() { positioning(); }

function positioning() {
	var ps = document.body.offsetWidth;
	var mybg = document.getElementById("nf_bg");
	
	if (ps <= 1000) {
		mybg.style.backgroundImage = ('none');
	} else {
		mybg.style.backgroundImage = 'url(images/top/bg_parts.png)';
	}
}