var rndm;
rndm = Math.ceil(3 * Math.random() );
switch (rndm){
	case 1:
		document.write('<a href="./products/pm/018.html"><img src="./images/home/main_2.jpg" width="587" height="172" alt="Photosensitive dry films Photec"></a>');
		break;
	case 2:
		document.write('<img src="./images/home/main_3.jpg" width="587" height="172" alt="Working On Wonders">');
		break;
	default:
		document.write('<img src="./images/home/main_4.jpg" width="587" height="172" alt="Working On Wonders">');
		break;
}