if(document.images) 
{    
  mn_products_on = new Image;
  mn_products_on.src = 'img/mn_products_on.gif';
  mn_products_off = new Image;
  mn_products_off.src = 'img/mn_products_off.gif';     

  mn_company_on = new Image;
  mn_company_on.src = 'img/mn_company_on.gif';
  mn_company_off = new Image;
  mn_company_off.src = 'img/mn_company_off.gif';     

  mn_partners_on = new Image;
  mn_partners_on.src = 'img/mn_partners_on.gif';
  mn_partners_off = new Image;
  mn_partners_off.src = 'img/mn_partners_off.gif';     

  mn_support_on = new Image;
  mn_support_on.src = 'img/mn_support_on.gif';
  mn_support_off = new Image;
  mn_support_off.src = 'img/mn_support_off.gif';     
}

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;
  }
}