isamap = new Object();
isamap[0] = "_df"
isamap[1] = "_ov"
isamap[2] = "_ot"
isamap[3] = "_dn"

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

if (document.images) { // ensure browser can do JavaScript rollovers.
isimages = new Object();
isimages.nav_buttons_df = new Image();
isimages.nav_buttons_df.src = "../images/nav_buttonshome.jpg";

isimages.nav_buttons_ov = new Image();
isimages.nav_buttons_ov.src = "../images/nav_buttonshomeov.jpg";

isimages.nav_buttons1_df = new Image();
isimages.nav_buttons1_df.src = "../images/nav_buttonsabout.jpg";

isimages.nav_buttons1_ov = new Image();
isimages.nav_buttons1_ov.src = "../images/nav_buttonsaboutov.jpg";

isimages.nav_buttons2_df = new Image();
isimages.nav_buttons2_df.src = "../images/nav_buttonsbooks.jpg";

isimages.nav_buttons2_ov = new Image();
isimages.nav_buttons2_ov.src = "../images/nav_buttonsbooksov.jpg";

isimages.nav_buttons3_df = new Image();
isimages.nav_buttons3_df.src = "../images/nav_buttonsevents.jpg";

isimages.nav_buttons3_ov = new Image();
isimages.nav_buttons3_ov.src = "../images/nav_buttonseventsov.jpg";

isimages.nav_buttons4_df = new Image();
isimages.nav_buttons4_df.src = "../images/nav_buttonsblog.jpg";

isimages.nav_buttons4_ov = new Image();
isimages.nav_buttons4_ov.src = "../images/nav_buttonsblogov.jpg";

isimages.nav_buttons5_df = new Image();
isimages.nav_buttons5_df.src = "../images/nav_buttonslinks.jpg";

isimages.nav_buttons5_ov = new Image();
isimages.nav_buttons5_ov.src = "../images/nav_buttonslinksov.jpg";

isimages.nav_buttons6_df = new Image();
isimages.nav_buttons6_df.src = "../images/nav_buttonsgo.jpg";

isimages.nav_buttons6_ov = new Image();
isimages.nav_buttons6_ov.src = "../images/nav_buttonsgoov.jpg";

}