function fetch_object(idname)
{
    var my_obj = document.getElementById(idname);
	//alert(my_obj);
    return my_obj;
}
/*function dis(obj)
{
	for (i = 2; i<= 9; i++  )
    {
		var nav_img = fetch_object("nav_" + i);
        var sub_nav = fetch_object("sub_nav_" + i);
        var sub_nav_index =  fetch_object("sub_nav_0");
        sub_nav_index.style.display = "none";;
		if (obj == i)
        {
			nav_img.src = "images/head1_" + i + ".gif";
            sub_nav.style.display = "none";
		}
	}
}*/
function toggle_nav(obj)
{
    for (i = 3; i<=7; i++  )
    {
        //alert(obj);
        var nav_img = fetch_object("nav_" + i);
        if (obj == i)
        {
            nav_img.src = "images/main1_0" + i + ".jpg";

        }
        else
        {
            nav_img.src = "images/main_0" + i + ".jpg";
        }
    }
}