function resizewindow(){
	
	wh=$(window).height();
	ww=$(window).width();
	iw=1920;
	ih=1280;
	if((ww/wh)>(iw/ih)){
		$('#bgrimg').css("width","100%");
		$('#bgrimg').css("height","auto");
	}else{
		$('#bgrimg').css("height",wh+"px");
		$('#bgrimg').css("width","auto");
	}

}

$(window).resize(resizewindow);
resizewindow();