if(document.images) 
{    
  menu1_on = new Image;
  menu1_on.src = 'img/menu1_on.png';
  menu1_off = new Image;
  menu1_off.src = 'img/menu1_off.png';     

  menu2_on = new Image;
  menu2_on.src = 'img/menu2_on.png';
  menu2_off = new Image;
  menu2_off.src = 'img/menu2_off.png';     

  menu3_on = new Image;
  menu3_on.src = 'img/menu3_on.png';
  menu3_off = new Image;
  menu3_off.src = 'img/menu3_off.png';     

  menu4_on = new Image;
  menu4_on.src = 'img/menu4_on.png';
  menu4_off = new Image;
  menu4_off.src = 'img/menu4_off.png';     

  menu5_on = new Image;
  menu5_on.src = 'img/menu5_on.png';
  menu5_off = new Image;
  menu5_off.src = 'img/menu5_off.png';     

  menu6_on = new Image;
  menu6_on.src = 'img/menu6_on.png';
  menu6_off = new Image;
  menu6_off.src = 'img/menu6_off.png';     


  pn_01_on = new Image;
  pn_01_on.src = 'img/pn_01_on.png';
  pn_01_off = new Image;
  pn_01_off.src = 'img/pn_01_off.png';     

  pn_02_on = new Image;
  pn_02_on.src = 'img/pn_02_on.png';
  pn_02_off = new Image;
  pn_02_off.src = 'img/pn_02_off.png';     

  pn_03_on = new Image;
  pn_03_on.src = 'img/pn_03_on.png';
  pn_03_off = new Image;
  pn_03_off.src = 'img/pn_03_off.png';     

  pn_04_on = new Image;
  pn_04_on.src = 'img/pn_04_on.png';
  pn_04_off = new Image;
  pn_04_off.src = 'img/pn_04_off.png';     

  pn_05_on = new Image;
  pn_05_on.src = 'img/pn_05_on.png';
  pn_05_off = new Image;
  pn_05_off.src = 'img/pn_05_off.png';     


  sn_01_on = new Image;
  sn_01_on.src = 'img/sn_01_on.png';
  sn_01_off = new Image;
  sn_01_off.src = 'img/sn_01_off.png';     

  sn_02_on = new Image;
  sn_02_on.src = 'img/sn_02_on.png';
  sn_02_off = new Image;
  sn_02_off.src = 'img/sn_02_off.png';     

  sn_03_on = new Image;
  sn_03_on.src = 'img/sn_03_on.png';
  sn_03_off = new Image;
  sn_03_off.src = 'img/sn_03_off.png';     

  sn_04_on = new Image;
  sn_04_on.src = 'img/sn_04_on.png';
  sn_04_off = new Image;
  sn_04_off.src = 'img/sn_04_off.png';     

  sn_05_on = new Image;
  sn_05_on.src = 'img/sn_05_on.png';
  sn_05_off = new Image;
  sn_05_off.src = 'img/sn_05_off.png';     


  bn_01_on = new Image;
  bn_01_on.src = 'img/bn_01_on.png';
  bn_01_off = new Image;
  bn_01_off.src = 'img/bn_01_off.png';     

  bn_02_on = new Image;
  bn_02_on.src = 'img/bn_02_on.png';
  bn_02_off = new Image;
  bn_02_off.src = 'img/bn_02_off.png';     

  bn_03_on = new Image;
  bn_03_on.src = 'img/bn_03_on.png';
  bn_03_off = new Image;
  bn_03_off.src = 'img/bn_03_off.png';     

  bn_04_on = new Image;
  bn_04_on.src = 'img/bn_04_on.png';
  bn_04_off = new Image;
  bn_04_off.src = 'img/bn_04_off.png';     

  bn_05_on = new Image;
  bn_05_on.src = 'img/bn_05_on.png';
  bn_05_off = new Image;
  bn_05_off.src = 'img/bn_05_off.png';     


  pr_01_v1_on = new Image;
  pr_01_v1_on.src = 'img/pr_01_v1_on.png';
  pr_01_v1_off = new Image;
  pr_01_v1_off.src = 'img/pr_01_v1_off.png';     

  pr_02_v1_on = new Image;
  pr_02_v1_on.src = 'img/pr_02_v1_on.png';
  pr_02_v1_off = new Image;
  pr_02_v1_off.src = 'img/pr_02_v1_off.png';     

  pr_03_v1_on = new Image;
  pr_03_v1_on.src = 'img/pr_03_v1_on.png';
  pr_03_v1_off = new Image;
  pr_03_v1_off.src = 'img/pr_03_v1_off.png';     

  pr_04_v1_on = new Image;
  pr_04_v1_on.src = 'img/pr_04_v1_on.png';
  pr_04_v1_off = new Image;
  pr_04_v1_off.src = 'img/pr_04_v1_off.png';     


  pr_01_v2_on = new Image;
  pr_01_v2_on.src = 'img/pr_01_v2_on.png';
  pr_01_v2_off = new Image;
  pr_01_v2_off.src = 'img/pr_01_v2_off.png';     

  pr_02_v2_on = new Image;
  pr_02_v2_on.src = 'img/pr_02_v2_on.png';
  pr_02_v2_off = new Image;
  pr_02_v2_off.src = 'img/pr_02_v2_off.png';     

  pr_03_v2_on = new Image;
  pr_03_v2_on.src = 'img/pr_03_v2_on.png';
  pr_03_v2_off = new Image;
  pr_03_v2_off.src = 'img/pr_03_v2_off.png';     

  pr_04_v2_on = new Image;
  pr_04_v2_on.src = 'img/pr_04_v2_on.png';
  pr_04_v2_off = new Image;
  pr_04_v2_off.src = 'img/pr_04_v2_off.png';     

}

function imgAct(img_name)
{
  if(document.images) {
    img_on = eval(img_name + '_on.src');      
	document.getElementById(img_name).src = img_on;
  }
}

function imgInact(img_name)
{
  if(document.images) {
    img_off = eval(img_name + '_off.src');          
    document.getElementById(img_name).src = img_off;
  }
}