(function($){
var $window=$(window);
var windowHeight=$window.height();
$window.resize(function (){
windowHeight=$window.height();
});
$.fn.parallax=function(xpos, speedFactor, outerHeight){
var $this=$(this);
var getHeight;
var firstTop;
var paddingTop=0;
$this.each(function(index){
firstTop=$this.offset().top;
});
if(outerHeight){
getHeight=function(jqo){
return jqo.outerHeight(true);
};}else{
getHeight=function(jqo){
return jqo.height();
};}
if(arguments.length < 1||xpos===null) xpos="50%";
if(arguments.length < 2||speedFactor===null) speedFactor=0.1;
if(arguments.length < 3||outerHeight===null) outerHeight=true;
if(arguments.length < 4||pos===null) pos=0;
function update(){
var pos=$window.scrollTop();
$this.each(function(){
var $element=$(this);
var top=$element.offset().top;
var height=getHeight($element);
if(top + height < pos||top > pos + windowHeight){
return;
}
if($(window).width() > 1050){
$this.css('backgroundPosition', xpos + " " +(( top - pos) * speedFactor) + "px");
}else{
$this.css('backgroundPosition','');
}});
}
$window.bind('scroll', update).resize(update);
update();
};})(jQuery);