if(document.images)  {

homeoff = new Image();
homeoff.src = "images/home_off.png";
homeon = new Image();
homeon.src = "images/home_over.png";

manufoff = new Image();
manufoff.src = "images/manuf_off.png";
manufon = new Image();
manufon.src = "images/manuf_over.png";

companyoff = new Image();
companyoff.src = "images/company_off.png";
companyon = new Image();
companyon.src = "images/company_over.png";

industryoff = new Image();
industryoff.src = "images/industry_off.png";
industryon = new Image();
industryon.src = "images/industry_over.png";

contactoff = new Image();
contactoff.src = "images/contact_off.png";
contacton = new Image();
contacton.src = "images/contact_over.png";


} 

function onoff(imgName,state) {
        if(document.images) {               
		document.images[imgName].src = eval(imgName+state+".src");
        }
}