var nav_timeout = null;

function nav_over(id, section) {
    if (document.getElementById && document.getElementsByTagName) {
        
        var nav1 = document.getElementById('nav1');
        //var num_sections = nav1.getElementsByTagName('img').length;
	var num_sections = '5';        

        for (i = 1; i <= num_sections; i++) {
            if (id != i) {
                var ul = document.getElementById('nav1_' + i);
                if (ul) {
                    ul.style.display = 'none';
                }
            }
        }
        
        var target = document.getElementById('nav1_' + id);
        if (target) {
            //target.style.top = (260 + (1) * 26) + 'px';
			//target.style.top = (260 + (id - 1) * 26) + 'px';
            target.style.top = '282px';
			target.style.display = 'block';
        }
            
        if (nav_timeout != null) {
            clearTimeout(nav_timeout);
        }
    }
}

function nav_out(id) {
    if (document.getElementById) {
        if (nav_timeout != null) {
            clearTimeout(nav_timeout);
        }
        nav_timeout = setTimeout('nav_hide(' + id + ');', 1000);
    }
}

function nav_hide(id) {
    
    nav_timeout = null;
    
    var target = document.getElementById('nav1_' + id);
    if (target) {
        target.style.display = 'none';
    }
    
}