if (document.images)
 {
	preload_image_object = new Image();
	image_url = new Array();
	image_url[0] = "/webimages/env_nav_prod_y.gif";
	image_url[1] = "/webimages/env_nav_prod_n.gif";
	
	image_url[2] = "/webimages/env_nav_order_y.gif";
	image_url[3] = "/webimages/env_nav_order_n.gif";
	
	image_url[4] = "/webimages/env_nav_contact_y.gif";
	image_url[5] = "/webimages/env_nav_contact_n.gif";
	
	image_url[6] = "/webimages/env_nav_what_y.gif";
	image_url[7] = "/webimages/env_nav_what_n.gif";
	
	image_url[8] = "/webimages/env_nav_who_y.gif";
	image_url[9] = "/webimages/env_nav_who_n.gif";
	var i = 0;
	 for(i=0; i<=9; i++) 
	   preload_image_object.src = image_url[i];
 }


	menu_url = new Array();
	menu_url[0] = "showProduct.php";
	menu_url[1] = "order.php";
	
	menu_url[2] = "contact.php";
	menu_url[3] = "what.php";
	
	menu_url[4] = "who.php";


function showtopMenuButton(){

for(i=0;i<=4;i++){
document.getElementById('topMenuButton'+i).src=image_url[i*2+1];
}
document.getElementById('topMenuButton'+topMenuIndex).src=image_url[topMenuIndex*2];
}

function changetopMenu(passinIndex){
		 document.getElementById('topMenuLinkForm').topMenuIndex.value=passinIndex;
		 document.getElementById('topMenuLinkForm').action=menu_url[passinIndex];
		 document.getElementById('topMenuLinkForm').submit();
}