if (document.images) {

t1_off = new Image();
t1_off.src = "images/nav_t01.gif";
t1_on = new Image();
t1_on.src = "images/nav_t01_on.gif";

t21_off = new Image(); 
t21_off.src = "images/nav_t02-1.gif";
t21_on = new Image();
t21_on.src = "images/nav_t02-1_on.gif";

t22_off = new Image(); 
t22_off.src = "images/nav_t02-2.gif";
t22_on = new Image();
t22_on.src = "images/nav_t02-2_on.gif";

t3_off = new Image();
t3_off.src = "images/nav_t03.gif";
t3_on = new Image();
t3_on.src = "images/nav_t03_on.gif";

t4_off = new Image();
t4_off.src = "images/nav_t04.gif";
t4_on = new Image();
t4_on.src = "images/nav_t04_on.gif";

t5_off = new Image(); 
t5_off.src = "images/nav_t05.gif";
t5_on = new Image();
t5_on.src = "images/nav_t05_on.gif";

t6_off = new Image();
t6_off.src = "images/nav_t06.gif";
t6_on = new Image();
t6_on.src = "images/nav_t06_on.gif";

t7_off = new Image();
t7_off.src = "images/nav_t07.gif";
t7_on = new Image();
t7_on.src = "images/nav_t07_on.gif";

t8_off = new Image(); 
t8_off.src = "images/nav_t08.gif";
t8_on = new Image();
t8_on.src = "images/nav_t08_on.gif";

t9_off = new Image();
t9_off.src = "images/nav_t09.gif";
t9_on = new Image();
t9_on.src = "images/nav_t09_on.gif";

t10_off = new Image();
t10_off.src = "images/nav_t10.gif";
t10_on = new Image();
t10_on.src = "images/nav_t10_on.gif";

b1_off = new Image();
b1_off.src = "images/nav_b01.gif";
b1_on = new Image();
b1_on.src = "images/nav_b01_on.gif";

b21_off = new Image(); 
b21_off.src = "images/nav_b02-1.gif";
b21_on = new Image();
b21_on.src = "images/nav_b02-1_on.gif";

b22_off = new Image(); 
b22_off.src = "images/nav_b02-2.gif";
b22_on = new Image();
b22_on.src = "images/nav_b02-2_on.gif";

b3_off = new Image();
b3_off.src = "images/nav_b03.gif";
b3_on = new Image();
b3_on.src = "images/nav_b03_on.gif";

b4_off = new Image();
b4_off.src = "images/nav_b04.gif";
b4_on = new Image();
b4_on.src = "images/nav_b04_on.gif";

b5_off = new Image(); 
b5_off.src = "images/nav_b05.gif";
b5_on = new Image();
b5_on.src = "images/nav_b05_on.gif";

b6_off = new Image();
b6_off.src = "images/nav_b06.gif";
b6_on = new Image();
b6_on.src = "images/nav_b06_on.gif";

b7_off = new Image();
b7_off.src = "images/nav_b07.gif";
b7_on = new Image();
b7_on.src = "images/nav_b07_on.gif";

b8_off = new Image(); 
b8_off.src = "images/nav_b08.gif";
b8_on = new Image();
b8_on.src = "images/nav_b08_on.gif";

b9_off = new Image();
b9_off.src = "images/nav_b09.gif";
b9_on = new Image();
b9_on.src = "images/nav_b09_on.gif";

b10_off = new Image();
b10_off.src = "images/nav_b10.gif";
b10_on = new Image();
b10_on.src = "images/nav_b10_on.gif";
}

function Active(imgname){  
  if (document.images){
    newImage = eval(imgname + '_on.src')
    document.images[imgname].src = newImage;
  }
}

function Active2(imgname){  
  if (document.images){
    newImage = eval(imgname + '_on.src')
    document.images[imgname].src = newImage;
  }
}

function Inactive(imgname){
  if (document.images){
    newImage = eval(imgname + '_off.src')
    document.images[imgname].src = newImage;
  }
}