var DDSPEED = 10;
var DDTIMER = 15;
var actTabIndex = 1;

function initialize(){
	actTabIndex = 1;
	changeTab(actTabIndex);
}

// main function to handle the mouse events //
function muestrasubmenu(sm)
{
  if (document.getElementById(sm).style.display == "block")
   document.getElementById(sm).style.display="none";
  else
    document.getElementById(sm).style.display="block";
}

function ddMenu(d,menu){
  var h = document.getElementById('ddheader' + menu);
  var c = document.getElementById('ddcontent' + menu);
  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(){
  var h = document.getElementById('ddheader');
  var c = document.getElementById('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 changeTab(t){
	
	var newTabC = document.getElementById('page' + t);
	var newTabT = document.getElementById('title' + t);
	var actTabC = document.getElementById('page' + actTabIndex);
	var actTabT = document.getElementById('title' + actTabIndex);
	
	if (t == actTabIndex){
		return;
	}
	
	if ( t == 1 )
		newTabT.style.marginLeft = "0px";
	else
	    newTabT.style.marginLeft = "4px";
	  
	if ( actTabIndex == 1 )
		actTabT.style.marginLeft = "0px";
	else
	    actTabT.style.marginLeft = "4px";
	
	newTabT.className = "titleActive";
	actTabT.className = "titleInactive";
	
	newTabC.style.display = "block";
	actTabC.style.display = "none";
	
	actTabIndex = t;
	
}