function over(div) {
        div.style.backgroundColor = "#D5E9F0";
        div.className = dv.className.concat(" hover");
    }    
    function out(div, nr) {
        if (nr == 1) {
            div.style.backgroundColor = "#F3F1E2";
            div.className = "tab-oferty-1";
        } 
	else if (nr == 2) {
            div.style.backgroundColor = "#ffffff";
            div.className = "tab-oferty-2";
        }
    }