var DDSPEED = 10;
var DDTIMER = 15;

// main function to handle the mouse events //
function ddMenu(id,d){
  var h = document.getElementById(id + '-ddheader');
  var c = document.getElementById(id + '-ddcontent');
  clearInterval(c.timer);
  if(d == 1){
    clearTimeout(h.timer);
    if(c.maxh && c.maxh <= c.offsetHeight){return}
    else if(!c.maxh){
      c.style.display = 'block';
      c.style.height = 'auto';
      c.maxh = c.offsetHeight;
      c.style.height = '0px';
    }
    c.timer = setInterval(function(){ddSlide(c,1)},DDTIMER);
  }else{
    h.timer = setTimeout(function(){ddCollapse(c)},50);
  }
}

// collapse the menu //
function ddCollapse(c){
  c.timer = setInterval(function(){ddSlide(c,-1)},DDTIMER);
}

// cancel the collapse if a user rolls over the dropdown //
function cancelHide(id){
  var h = document.getElementById(id + '-ddheader');
  var c = document.getElementById(id + '-ddcontent');
  clearTimeout(h.timer);
  clearInterval(c.timer);
  if(c.offsetHeight < c.maxh){
    c.timer = setInterval(function(){ddSlide(c,1)},DDTIMER);
  }
}

// incrementally expand/contract the dropdown and change the opacity //
function ddSlide(c,d){
  var currh = c.offsetHeight;
  var dist;
  if(d == 1){
    dist = (Math.round((c.maxh - currh) / DDSPEED));
  }else{
    dist = (Math.round(currh / DDSPEED));
  }
  if(dist <= 1 && d == 1){
    dist = 1;
  }
  c.style.height = currh + (dist * d) + 'px';
  c.style.opacity = currh / c.maxh;
  c.style.filter = 'alpha(opacity=' + (currh * 100 / c.maxh) + ')';
  if((currh < 2 && d != 1) || (currh > (c.maxh - 2) && d == 1)){
    clearInterval(c.timer);
  }
}



function getNews(){
	var  choice;
	var  month = document.forms["period"].month.value;
	var  mind = document.forms["period"].month.selectedIndex;
	var ar  = document.forms["period"].year.value;
	var year  = "20" + ar;
	var f = (parseInt(year) - 2009) * 12 + parseInt(mind);
	var  today = new Date();
	var y = today.getFullYear();
	var m = today.getMonth();
	var f_ac = (y - 2009) * 12 + m;

	if(f <= 11)
		choice = "/rus/news/news.html";
	else{
			if(f < f_ac)
			  choice = "/ru/news/news-20" + ar + "/" + month + "-" + ar + ".html";
			else
			  choice = "/ru/news/news.html";
		}
	window.location = choice;  
	};
	
function getNewsEn(){
	var  choice;
	var  month = document.forms["period"].month.value;
	var  mind = document.forms["period"].month.selectedIndex;
	var ar  = document.forms["period"].year.value;
	var year  = "20" + ar;
	var f = (parseInt(year) - 2009) * 12 + parseInt(mind);
	var  today = new Date();
	var y = today.getFullYear();
	var m = today.getMonth();
	var f_ac = (y - 2009) * 12 + m;

	if(f <= 11)
		choice = "/eng/news/news.html";
	else{
			if(f < f_ac)
			  choice = "/en/news/news-20" + ar + "/" + month + "-" + ar + ".html";
			else
			  choice = "/en/news/news.html";
		}
	window.location = choice;  
	};