d = new Image();
d.src = "d_a.gif";

e = new Image();
e.src = "e_a.gif";

f = new Image();
f.src = "f_a.gif";

i = new Image();
i.src = "i_a.gif";


function movepic(img_name,img_src) {
	document[img_name].src= img_name + "_" + img_src + ".gif";
}