//MENU ROLLOVER
if (document.images) {
nav1on   = new Image(); nav1on.src   = "_images/menu_abouton.gif";
nav1off  = new Image(); nav1off.src  = "_images/menu_about.gif";
nav2on   = new Image(); nav2on.src   = "_images/menu_ecommerceon.gif";
nav2off  = new Image(); nav2off.src  = "_images/menu_ecommerce.gif";
nav3on   = new Image(); nav3on.src   = "_images/menu_vendingon.gif";
nav3off  = new Image(); nav3off.src  = "_images/menu_vending.gif";
nav4on   = new Image(); nav4on.src   = "_images/menu_merchon.gif";
nav4off  = new Image(); nav4off.src  = "_images/menu_merch.gif";
nav5on   = new Image(); nav5on.src   = "_images/menu_serviceon.gif";
nav5off  = new Image(); nav5off.src  = "_images/menu_service.gif";
}

function rollOn(img){
    if (document.images) {
        document[img].src=eval(img + "on.src");
    }
}

function rollOff(img){
    if (document.images) {
		document[img].src=eval(img + "off.src");
	}
}