var img1_off = new Image(); img1_off.src = "images/nav_01.gif";
var img1_over = new Image(); img1_over.src = "images/nav_01_on.gif";
var img2_off  = new Image(); img2_off.src = "images/nav_02.gif";
var img2_over = new Image(); img2_over.src = "images/nav_02_on.gif";
var img3_off  = new Image(); img3_off.src = "images/nav_03.gif";
var img3_over = new Image(); img3_over.src = "images/nav_03_on.gif"
var img4_off  = new Image(); img4_off.src = "images/nav_04.gif";
var img4_over = new Image(); img4_over.src = "images/nav_04_on.gif";
var img5_off  = new Image(); img5_off.src = "images/nav_05.gif";
var img5_over = new Image(); img5_over.src = "images/nav_05_on.gif";
var img6_off  = new Image(); img6_off.src = "images/nav_06.gif";
var img6_over = new Image(); img6_over.src = "images/nav_06_on.gif";
var img7_off  = new Image(); img7_off.src = "images/nav_07.gif";
var img7_over = new Image(); img7_over.src = "images/nav_07_on.gif";
var img7a_off  = new Image(); img7a_off.src = "images/nav_07a.gif";
var img7a_over = new Image(); img7a_over.src = "images/nav_07a_on.gif";
var img8_off  = new Image(); img8_off.src = "images/nav_08.gif";
var img8_over = new Image(); img8_over.src = "images/nav_08_on.gif";
var img9_off  = new Image(); img9_off.src = "images/nav_09.gif";
var img9_over = new Image(); img9_over.src = "images/nav_09_on.gif";


d=document.images;
var Locked = "none";
function ROVER(N){ if( N != Locked && document.images )d[N].src = eval( N + "_over" + ".src;");}
function ROUT(N){ if( N != Locked && document.images ) d[N].src =d[N].src= eval( N + "_off" + ".src;"); window.focus();}
function RLOCK(N){ Locked = N; if( N != "" && document.images ){ d[N].src = d[N].src = eval( N + "_over" + ".src;"); } ROUT('img1'); ROUT('img2'); ROUT('img3'); ROUT('img4'); ROUT('img5'); ROUT('img6'); ROUT('img7'); ROUT('img8'); ROUT('img9')}