var new_right = ($(window).scrollLeft() + $(window).width() - $(document).width() + original_right) + 'px'

var new_left = (original_left - $(window).scrollLeft()) + 'px'

(function($){
$.ScrollFixed = function(el, options){
var base = this;
base.$el = $(el);
base.el = el;
var target = base.$el;
var original_left = parseInt(target.css('left'));
var original_right = parseInt(target.css('right'));

var _fix_position = function(){
if(base.options.fixed == 'right'){
target.css('right', ($(window).scrollLeft() + $(window).width() - $(document).width() + original_right) + 'px');
} else if(base.options.fixed == 'left'){
target.css('left', (original_left - $(window).scrollLeft()) + 'px');
}
};

var windowResize = function(){
_fix_position();
};

var windowScroll = function(){
_fix_position();
};

base.init = function(){
base.options = $.extend({}, $.ScrollFixed.defaultOptions, options);
$(window).resize(windowResize);
$(window).scroll(windowScroll);
_fix_position();
console.log(base.options.fixed);
};

base.init();
};

$.ScrollFixed.defaultOptions = {
fixed:'left'
};

$.fn.scrollFixed = function(options){
return this.each(function(){
(new $.ScrollFixed(this, options));
});
};
})(jQuery);

$('#leftsider').scrollFixed({fixed:'left'});
$('#rightsider').scrollFixed({fixed:'right'});