function mousechange(topic,selfimg,topic1,pic) { 	document.images[topic].src=selfimg;	document.images[topic1].src=pic;}
function preloadimg(){	 preload('images/about1.gif');	 preload('images/contract1.gif');	 preload('images/contact1.gif');	 preload('images/order1.gif');	 preload('images/home1.gif');	 preload('images/about.gif');	 preload('images/contract.gif');	 preload('images/contact.gif');	 preload('images/order.gif');	 preload('images/home.gif');}