if (document.images) {
	a_1 = new Image;
	a_1.src = "hoover/photo1.jpg";
	a_2 = new Image;
	a_2.src = "hoover/photo2.jpg";
    a_3 = new Image;
    a_3.src= "hoover/photo3.jpg";
    a_4 = new Image;
    a_4.src= "hoover/photo4.jpg";
    a_5 = new Image;
    a_5.src= "hoover/photo5.jpg";
    a_6 = new Image;
    a_6.src= "hoover/photo6.jpg";
    a_7 = new Image;
    a_7.src= "hoover/photo7.jpg";  
}

function showImg(imgname, rollname)
{
	if (document.images) {
		window.onerror = null;
		document.getElementById(rollname).src=eval(imgname + ".src");
	}
}