function btnDn(imageName) {
	if (document.images) {
		document.images[imageName].src = eval(imageName + "_dn.src");
	}
}


function btnUp(imageName) {
	if (document.images) {
		document.images[imageName].src = eval(imageName + "_up.src");
	}
}


if (document.images) {
	//VT Global Menu
	var base = "../i/products/tabs/";
	btn_at_dn = new Image;   	btn_at_dn.src = base + "tab_at_off_dn.gif";
	btn_knobbies_dn = new Image;   	btn_knobbies_dn.src = base + "tab_knobbies_off_dn.gif";
	btn_sand_dn = new Image;   	btn_sand_dn.src = base + "tab_sand_off_dn.gif";
	btn_motorcycle_dn = new Image;   	btn_motorcycle_dn.src = base + "tab_motorcycle_off_dn.gif";
	btn_mud_dn = new Image;   	btn_mud_dn.src = base + "tab_mud_off_dn.gif";
	
	btn_at_up = new Image;   	btn_at_up.src = base + "tab_at_off_up.gif";
	btn_knobbies_up = new Image;   	btn_knobbies_up.src = base + "tab_knobbies_off_up.gif";
	btn_sand_up = new Image;   	btn_sand_up.src = base + "tab_sand_off_up.gif";
	btn_motorcycle_up = new Image;   	btn_motorcycle_up.src = base + "tab_motorcycle_off_up.gif";
	btn_mud_up = new Image;   	btn_mud_up.src = base + "tab_mud_off_up.gif";

}