if (document.images) { /* preload our plus/minus images */
    plus = new Image; plus.src = 'images/plus.gif'; 
    minus = new Image; minus.src = 'images/minus.gif';
    arrow1 = new Image; arrow1.src = 'images/arrow1.gif'; 
    arrow2 = new Image; arrow2.src = 'images/arrow2.gif';
}
function showNavDiv(el,parEl) { 
    if (document.getElementById(el)) {
        navAr = new Array;
        navAr = ['vakif','yayinlar'];
        var tmpDisplay = document.getElementById(el).style.display;
        for (var i = 0; i < navAr.length; i++) { 
            document.getElementById(navAr[i] + 'Im').src = arrow1.src;
            document.getElementById(navAr[i]).style.display = 'none';
        }
        if (parEl != null) { 
            document.getElementById(parEl + 'Im').src = arrow2.src;
            document.getElementById(parEl).style.display = 'block';
        }
        if (tmpDisplay == 'block') { 
            document.getElementById(el + 'Im').src = arrow1.src;
            document.getElementById(el).style.display = 'none';
        } else {
            document.getElementById(el + 'Im').src = arrow2.src;
            document.getElementById(el).style.display = 'block';
        }
    }
}
function changeClass(obj,dir,cl) {
    if (obj != null || dir != null) {
        var end = obj.className.substr(obj.className.length-3, obj.className.length-1);
        if (dir == 1 && end != 'Hov') { /* add 'Hov' to the end */
            obj.className = obj.className + 'Hov';
        } else if (dir == 2 && end == 'Hov') { /* strip off last 3 chars 'Hov' */
            obj.className = obj.className.substr(0,obj.className.length-3);
        } else if  (dir == 0) {
            myObj = document.getElementById(obj);
            myObj.className = cl;
        }
    }
}