var currItem = 'none';

if (document.images) {
	company = new Image();
  	company.src = "img/design/btn_company.jpg";
  	company_on = new Image();
  	company_on.src = "img/design/btn_company_on.jpg";

  	individuals = new Image();
  	individuals.src = "img/design/btn_individuals.jpg";
  	individuals_on = new Image();
  	individuals_on.src = "img/design/btn_individuals_on.jpg";
    
  	professionals = new Image();
  	professionals.src = "img/design/btn_professionals.jpg";
  	professionals_on = new Image();
  	professionals_on.src = "img/design/btn_professionals_on.jpg";
  
  	news = new Image();
  	news.src = "img/design/btn_news.jpg";
  	news_on = new Image();
  	news_on.src = "img/design/btn_news_on.jpg";
    
  	contact = new Image();
  	contact.src = "img/design/btn_contact.jpg";
  	contact_on = new Image();
  	contact_on.src = "img/design/btn_contact_on.jpg";
}

function switchOn(imgName) {
    if (document.images) {
      document[imgName].src = eval(imgName + "_on.src");
    }
}
  
function switchOff(imgName) {
    if (document.images) {
      document[imgName].src = eval(imgName + ".src");
    }
}

function switchOffComplement(imgName) {
	if (imgName != 'company') {
      document['company'].src = eval("company.src");
    }
	if (imgName != 'individuals') {
      document['individuals'].src = eval("individuals.src");
    }
	if (imgName != 'professionals') {
      document['professionals'].src = eval("professionals.src");
    }
	if (imgName != 'news') {
      document['news'].src = eval("news.src");
    }
	if (imgName != 'contact') {
      document['contact'].src = eval("contact.src");
    }
    
    currItem = imgName;
}

function isCurrItem(imgName) {

	if( imgName == currItem ) {
	
		return(true);
		
	} else {
	
		return(false);
	}
}