function addLoadEvent(func) {
	var oldonload = window.onload;
	if (typeof window.onload != 'function') {
		window.onload = func;
	}
	else {
		window.onload = function() {
			oldonload();
			func();
		}
	}
}

function preLoadImages() {
	imgp0 = new Image();
	imgp1 = new Image();
	imgp2 = new Image();
	imgp3 = new Image();
	imgp4 = new Image();
	imgp5 = new Image();
	
    imgp0.scr = "/about-us/assets/art-0.jpg";
    imgp1.src = "/about-us/assets/art-3.jpg";
    imgp2.src = "/about-us/assets/art-5.jpg";
    imgp3.src = "/about-us/assets/art-1.jpg";
    imgp4.src = "/about-us/assets/art-2.jpg";
    imgp5.src = "/about-us/assets/art-4.jpg";
}

function img_switch (id) {
	var art = document.getElementById("art");
	
	art_src = "/about-us/assets/art-" + id + ".jpg";
	
	art.setAttribute("src",art_src);
	
	return false;
}

addLoadEvent(preLoadImages);