active_dropdown = -1;
dropdown_over = 0;
dropdown_timer = 0;
function activ(key){
var e = document.getElementById("td_"+key);
  } 

function noactiv(key){
var e = document.getElementById("td_"+key); 

  } 
  
function show_dropdown(key)
{
    var e = document.getElementById("dropdown_"+active_dropdown);
    if(e) e.style.display = "none";
    var e = document.getElementById("dropdown_"+key);
    if(!e) return;
    var top = get_element_position(e.parentNode).top;
    var left = get_element_position(e.parentNode).left; 
    e.style.width = e.parentNode.offsetWidth+"px";
    e.style.top = top + e.parentNode.offsetHeight+"px";  
    e.style.left = left+"px";
       
    e.style.display = "block";
    active_dropdown = key;
    dropdown_over = 1;
    dropdown_timer = 10;
}

function hide_dropdown()
{
    dropdown_over = 0;
}

function dropdown_tick()
{
    if(!dropdown_over)dropdown_timer--;
    if(dropdown_timer<=0)
    {
        var e = document.getElementById("dropdown_"+active_dropdown);
        if(e) e.style.display = "none";
    }
}
setInterval(dropdown_tick,50);

function get_element_position(e)
    {
        var left = 0;
        var top = 0;
        while(e) {
            left += e.offsetLeft;
            top += e.offsetTop;
            e = e.offsetParent; }
        return { left:left, top:top }
    }