function dE(n, s, type) {
	if (!type) 	{
		type = 'block';
	}
	var e = document.getElementById(n);
	if (!s) {
		s = (e.style.display == '') ? -1 : 1;
	}
	e.style.display = (s == 1) ? type : 'none';
}
function navigation(value) {
    var btn = new Array;
    var text = new Array;
    
    btn[1] = document.getElementById("company");
    btn[2] = document.getElementById("products");
    btn[3] = document.getElementById("contacts");
    
    text[1] = document.getElementById("content_company");
    text[2] = document.getElementById("content_products");
    text[3] = document.getElementById("content_contacts");

    if (value == 1) {
        text[1].style.display = "block";
        text[2].style.display = "none";
        text[3].style.display = "none";
        btn[1].src = "i/nav/company-a.png";
        btn[2].src = "i/nav/products.png";
        btn[3].src = "i/nav/contacts.png";
        }
    else if (value == 2) {
        text[1].style.display = "none";
        text[2].style.display = "block";
        text[3].style.display = "none";
        btn[1].src = "i/nav/company.png";
        btn[2].src = "i/nav/products-a.png";
        btn[3].src = "i/nav/contacts.png";
    }
    else if (value == 3) {
        text[1].style.display = "none";
        text[2].style.display = "none";
        text[3].style.display = "block";
        btn[1].src = "i/nav/company.png";
        btn[2].src = "i/nav/products.png";
        btn[3].src = "i/nav/contacts-a.png";
    }
    else {
        text[1].style.display = "block";
        text[2].style.display = "none";
        text[3].style.display = "none";
        btn[1].src = "i/nav/company-a.png";
        btn[2].src = "i/nav/products.png";
        btn[3].src = "i/nav/contacts.png";
    }
}