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.i1_df = new Image();
 isimages.i1_df.src = "images/link1.bmp";
 isimages.i1_ov = new Image();
 isimages.i1_ov.src = "images/link1_a.bmp";
 isimages.i2_df = new Image();
 isimages.i2_df.src = "images/link2.bmp";
 isimages.i2_ov = new Image();
 isimages.i2_ov.src = "images/link2_a.bmp";
 isimages.i3_df = new Image();
 isimages.i3_df.src = "images/link3.bmp";
 isimages.i3_ov = new Image();
 isimages.i3_ov.src = "images/link3_a.bmp";
 isimages.i4_df = new Image();
 isimages.i4_df.src = "images/link4.bmp";
 isimages.i4_ov = new Image();
 isimages.i4_ov.src = "images/link4_a.bmp";
}