if(document.images)  {

homeoff = new Image();
homeoff.src = "images/homeoff.jpg";
homeon = new Image();
homeon.src = "images/homeon.jpg";

manufacturersoff = new Image();
manufacturersoff.src = "images/manufacturersoff.jpg";
manufacturerson = new Image();
manufacturerson.src = "images/manufacturerson.jpg";

companyoff = new Image();
companyoff.src = "images/companyoff.jpg";
companyon = new Image();
companyon.src = "images/companyon.jpg";

industryoff = new Image();
industryoff.src = "images/industryoff.jpg";
industryon = new Image();
industryon.src = "images/industryon.jpg";

contactoff = new Image();
contactoff.src = "images/contactoff.jpg";
contacton = new Image();
contacton.src = "images/contacton.jpg";

territoryoff = new Image();
territoryoff.src = "images/territoryoff.jpg";
territoryon = new Image();
territoryon.src = "images/territoryon.jpg";

} 

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