image1 = new Image();
image1.src = "images/blank.gif";
image2 = new Image();
image2.src = "images/iconh.gif";

function move_in(img_name,img_src) {
document[img_name].src=img_src;
}

function move_out(img_name,img_src) {
document[img_name].src=img_src;
}