var DDSPEED = 3;
var DDTIMER = 100;

// 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 = '25px';
	  
    }
    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';
  
  
  var browser = navigator.appName
  
  
  //c.style.opacity = currh / c.maxh;
  //c.style.filter = 'alpha(opacity=' + (currh * 100 / c.maxh) + ')';
  if(browser=="Microsoft Internet Explorer")
  {
	c.style.opacity = 80;
    c.style.filter = 'alpha(opacity=60)';
	if(c.style.height == 1 + 'px')
	{
		//alert();
		c.style.opacity = 0;
    	c.style.filter = 'alpha(opacity=0)';
	}
	
	
  }
  if(browser=="Netscape")
  {
	  c.style.opacity = 0.7;
	  c.style.filter = 'alpha(opacity=0.7)';
	  if(c.style.height == 1 + 'px')
	{
		//alert();
		c.style.opacity = 0;
    	c.style.filter = 'alpha(opacity=0)';
	}
  }
  
  
  if((currh < 2 && d != 1) || (currh > (c.maxh - 2) && d == 1)){
    clearInterval(c.timer);
  }
}
function dtover(id1)
{
	document.getElementById(id1).style.background='url(\'images/common/mouseover-bg.gif\')';
	document.getElementById(id1).style.height="38px";
	document.getElementById(id1).style.color="#000000";
}
function dtout(id1)
{
	document.getElementById(id1).style.background='url(\'images/common/blue-bg.gif\')';;
	document.getElementById(id1).style.height="38px";
	document.getElementById(id1).style.color="#FFFFFF";
}