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.topmenubar13_df = new Image();
isimages.topmenubar13_df.src = "images/topmenubarhome_page.gif";

isimages.topmenubar13_ov = new Image();
isimages.topmenubar13_ov.src = "images/topmenubarhome_pageov.gif";

isimages.topmenubar15_df = new Image();
isimages.topmenubar15_df.src = "images/topmenubarneco_pumping_syst.gif";

isimages.topmenubar15_ov = new Image();
isimages.topmenubar15_ov.src = "images/topmenubarneco_pumping_syov.gif";

isimages.topmenubar17_df = new Image();
isimages.topmenubar17_df.src = "images/topmenubarproduct_photos.gif";

isimages.topmenubar17_ov = new Image();
isimages.topmenubar17_ov.src = "images/topmenubarproduct_photosov.gif";

isimages.topmenubar19_df = new Image();
isimages.topmenubar19_df.src = "images/topmenubardistributed_produ.gif";

isimages.topmenubar19_ov = new Image();
isimages.topmenubar19_ov.src = "images/topmenubardistributed_proov.gif";

isimages.topmenubar21_df = new Image();
isimages.topmenubar21_df.src = "images/topmenubarcontact_us.gif";

isimages.topmenubar21_ov = new Image();
isimages.topmenubar21_ov.src = "images/topmenubarcontact_usov.gif";

}