function mainover(subname) { //main menu state to "on" when rolled over
		document.getElementById(subname).src='images/menu/'+subname+'-on.gif';		//mainmenu on state
}
function mainout(subname) { //main menu state to "off" when rolled out
		document.getElementById(subname).src='images/menu/'+subname+'-off.gif';		//mainmenu off state
}

if (document.images) //preload
{
  pic1= new Image(); 
  pic1.src="images/menu/home-on.jpg";
  pic2= new Image(); 
  pic2.src="images/menu/home-off.jpg"; 
  pic3= new Image(); 
  pic3.src="images/menu/services-on.jpg"; 
  pic4= new Image(); 
  pic4.src="images/menu/services-off.jpg";
  pic5= new Image(); 
  pic5.src="images/menu/contact-on.jpg";
  pic6= new Image(); 
  pic6.src="images/menu/contact-off.jpg";
  pic7= new Image(); 
  pic7.src="images/menu/showroom-on.jpg";
  pic8= new Image(); 
  pic8.src="images/menu/showroom-off.jpg";
}