jQuery.preloadImages = function() {
	for(var i = 0; i<arguments.length; i++) {
		jQuery("<img>").attr("src", arguments[i]);
	}
}
$.preloadImages("m-projects-on.jpg", "m-projects-off.jpg", "m-about-on.jpg", "m-about-off.jpg", "m-test-on.jpg", "m-test-off.jpg", "m-press-on.jpg", "m-press-off.jpg", "m-contact-on.jpg", "m-contact-off.jpg");
$(
	function() {
		$("img.rollover").hover(
			function() {
				this.src = this.src.replace("-off","-on");
			},
			function() {
				this.src = this.src.replace("-on","-off");
			}
		);
	}
)