var timeout    = 500;
var closetimer = 0;
var ddmenuitem = 0;
 
function terrapro_open() {
    terrapro_canceltimer();
    terrapro_close();
    ddmenuitem = $(this).find('ul').css('visibility', 'visible');
}
 
function terrapro_close() {
    if (ddmenuitem) ddmenuitem.css('visibility', 'hidden');
}
 
function terrapro_timer() {
    closetimer = window.setTimeout(terrapro_close, timeout);
}
 
function terrapro_canceltimer() {
    if (closetimer) {
        window.clearTimeout(closetimer);
        closetimer = null;
    }
}
 
$(document).ready(function() {
    $('#terrapro > li').bind('mouseover', terrapro_open);
    $('#terrapro > li').bind('mouseout',  terrapro_timer);
});
document.onclick = terrapro_close;