function Width() {
	if (window.innerWidth) return window.innerWidth;
	else if (document.documentElement && document.documentElement.clientWidth)
		return document.documentElement.clientWidth;
	else if (document.body && document.body.clientWidth)
		return document.body.clientWidth;
	else return null;
	}

function NastavRozlisenie()
{
var Sirka = Width();
var    Posun = -(1680 - Sirka); 

 document.getElementById('bgpattern').style.width = Sirka+'px';
 document.getElementById('bgpattern').style.backgroundPosition = Posun+'px 0px';
}