function Scaler() {
  
  var resize=function() {
    var wClient=$(window).width();
    var hClient=$(window).height();
    var wImage = $('#imgBG').width();
    var hImage = $('#imgBG').height();
    var rel = wImage/hImage;
  
    if (wClient/hClient <= wImage/hImage) {
      $('#imgBG').css('height', hClient);
      $('#imgBG').css('width', hClient*rel);
    } else {
      $('#imgBG').css('width', wClient);
      $('#imgBG').css('height',  wClient/rel);
    }
  }


	if(window.attachEvent){window.attachEvent('onload',resize);window.attachEvent('onresize',resize)}							//Attact events IE
	else{																														//Attact events others
		window.addEventListener('load',resize,false);
		window.addEventListener('resize',resize,false);
		window.addEventListener('scroll',resize,false);
		window.addEventListener('DOMContentLoaded',resize,false);
	}

	return resize;

};