picCoff = new Image();  picCoff.src = "icons/contents.gif";
picCon = new Image();   picCon.src =  "icons/cont_a.gif";
picCclk = new Image();  picCclk.src = "icons/cont_c.gif";
picUoff = new Image();  picUoff.src = "icons/up.gif";
picUon = new Image();   picUon.src = "icons/up_a.gif";
picUclk = new Image();  picUclk.src = "icons/up_c.gif";
picPoff = new Image();  picPoff.src = "icons/prev.gif";
picPon = new Image();   picPon.src = "icons/prev_a.gif";
picPclk = new Image();  picPclk.src = "icons/prev_c.gif";
picNoff = new Image();  picNoff.src = "icons/next.gif";
picNon = new Image();   picNon.src = "icons/next_a.gif";
picNclk = new Image();  picNclk.src = "icons/next_c.gif";
picIoff = new Image();  picIoff.src = "icons/index.gif";
picIon = new Image();   picIon.src = "icons/index_a.gif";
picIclk = new Image();  picIclk.src = "icons/index_c.gif";
picOoff = new Image();  picOoff.src = "icons/paper.gif";
picOon = new Image();   picOon.src = "icons/paper_a.gif";
picOclk = new Image();  picOclk.src = "icons/paper_c.gif";
function img_act(imgName,PicName)
{ document[PicName].src = eval(imgName + ".src"); }