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<script>
// Scroll básico con jQuery

$(document).ready(function(){

	var height = $(document).height();
	var limit = height/2;
	
	$(window).on("scroll",function(){
		if($(window).scrollTop()>limit){
			console.log('Has llegado a la mitad del documento');
			$(this).unbind("scroll");
		}
	});

});
</script>