if (document.images) {
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                nav0On.src = "images/homeovr.gif";
                nav1On = new Image();
                nav1On.src = "images/serviceovr.gif";
                nav2On = new Image();
                nav2On.src = "images/bioovr.gif";
                nav3On = new Image();
                nav3On.src = "images/linksovr.gif";
                nav4On = new Image();
                nav4On.src = "images/contovr.gif";
                nav5On = new Image();
                nav5On.src = "images/pgdovr.gif";
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                nav0Off.src = "images/homeoff.gif";
                nav1Off = new Image();
                nav1Off.src = "images/serviceoff.gif";
                nav2Off = new Image();
                nav2Off.src = "images/biooff.gif";
                nav3Off = new Image();
                nav3Off.src = "images/linksoff.gif"; 
                nav4Off = new Image();
                nav4Off.src = "images/contoff.gif";
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