isamap = new Object();
isamap[0] = "_df"
isamap[1] = "_ov"

function isimgact(id, act)
{
	if(document.images) document.images[id].src = eval( "isimages." + id + isamap[act] + ".src");
}

if (document.images) { 
isimages = new Object();
isimages.def1_df = new Image();
isimages.def1_df.src = "/img/sir_o.jpg";

isimages.def1_ov = new Image();
isimages.def1_ov.src = "/img/sir_n.jpg";

isimages.def2_df = new Image();
isimages.def2_df.src = "/img/odb_o.jpg";

isimages.def2_ov = new Image();
isimages.def2_ov.src = "/img/odb_n.jpg";
}