if (document.images) {
	img1N= new Image;
	img1N.src= 'images/main.jpg' ;
	img1H= new Image;
	img1H.src= 'images/main2.jpg' ;
	img2N= new Image;
	img2N.src= 'images/products.jpg' ;
	img2H= new Image;
	img2H.src= 'images/products2.jpg' 
	img3N= new Image;
	img3N.src= 'images/services.jpg' ;
	img3H= new Image;
	img3H.src= 'images/services2.jpg' 
	img4N= new Image;
	img4N.src= 'images/research.jpg' ;
	img4H= new Image;
	img4H.src= 'images/research2.jpg' 
	function myOn(myImgName) {
		document[myImgName].src=eval(myImgName+ 'H' ).src;
	}
	function myOut(myImgName) {
		document[myImgName].src=eval(myImgName+ 'N' ).src;
	}
}