$(document).ready(function() { 
	$(".mo").hover(
    function(){this.src = this.src.replace('_off','_on');},
    function(){this.src = this.src.replace('_on','_off');
    });
	$(".mo-1").hover(
    function(){this.src = this.src.replace('_off','_on');},
    function(){this.src = this.src.replace('_on','_off');
    });
	var imgSwap = [];
	$(".mo").each(function(){
	imgUrl = this.src.replace('_off','_on');
	imgSwap.push(imgUrl);
	});
	$(imgSwap).preload();
	});
	$.fn.preload = function() {
    this.each(function(){
    $('<img/>')[0].src = this;
    });
}