var element, last, t;
function timeHide()
{t = setTimeout("hideL()", 250);}
function showL(elem)
{clearTimeout(t);
if (last != null)
{document.getElementById(last).style.visibility = 'hidden';}
element = elem;
document.getElementById(elem).style.visibility = 'visible';
last = element;}
function hideL()
{document.getElementById(element).style.visibility = 'hidden';clearTimeout(t);}