if(document.images){

//top navigation on

var onImgs = new Array();
onImgs["home"] = new Image(61,16);
onImgs["home"].src = "image/topnav_search/home_o.gif";
onImgs["clip"] = new Image(116,16);
onImgs["clip"].src = "image/topnav_search/clip_o.gif";
onImgs["search"] = new Image(127,16);
onImgs["search"].src = "image/topnav_search/search_o.gif";
onImgs["demo"] = new Image(93,16);
onImgs["demo"].src = "image/topnav_search/demo_o.gif";
onImgs["comp"] = new Image(134,16);
onImgs["comp"].src = "image/topnav_search/comp_o.gif";
onImgs["clipdemand"] = new Image(121,16);
onImgs["clipdemand"].src = "image/topnav_search/clipdemand_o.gif";
onImgs["help"] = new Image(57,15);
onImgs["help"].src = "image/topnav_search/help_o.gif";


var offImgs = new Array();
offImgs["home"] = new Image(61,16);
offImgs["home"].src = "image/topnav_search/home.gif";
offImgs["clip"] = new Image(116,16);
offImgs["clip"].src = "image/topnav_search/clip.gif";
offImgs["search"] = new Image(127,16);
offImgs["search"].src = "image/topnav_search/search.gif";
offImgs["demo"] = new Image(93,16);
offImgs["demo"].src = "image/topnav_search/demo.gif";
offImgs["comp"] = new Image(134,16);
offImgs["comp"].src = "image/topnav_search/comp.gif";
offImgs["clipdemand"] = new Image(121,16);
offImgs["clipdemand"].src = "image/topnav_search/clipdemand.gif";
offImgs["help"] = new Image(57,16);
offImgs["help"].src = "image/topnav_search/help.gif";


}

	
function imgOn(imgName) {
        if (document.images) {
            document.images[imgName].src = onImgs[imgName].src;
        }
}

function imgOff(imgName) {
        if (document.images) {
            document.images[imgName].src = offImgs[imgName].src;
        }
}