var DDSPEED = 10;
var DDTIMER = 15;



var browserName = "";
var ua = navigator.userAgent.toLowerCase();
if ( ua.indexOf( "opera" ) != -1 ) {
	browserName = "opera";
} else if ( ua.indexOf( "msie" ) != -1 ) {
	browserName = "msie";
} else if ( ua.indexOf( "safari" ) != -1 ) {
	browserName = "safari";
} else if ( ua.indexOf( "mozilla" ) != -1 ) {
	if ( ua.indexOf( "firefox" ) != -1 ) {
		browserName = "firefox";
	} else {
		browserName = "mozilla";
		}
} 
		
if (browserName == 'opera' || browserName == 'safari') {
	DDSPEED=3;
} 

// 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.top = '-' + c.offsetHeight + 'px';
      c.style.display = 'block';
      c.style.height = 'auto';
      c.maxh = c.offsetHeight;
      c.style.height = '0px';
    }
    c.timer = setInterval(function(){ddSlide(c,1,id)},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 cent //
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,id){
  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;
  }
   
  //alert(navigator.appName) ;
  

  
  if (id=='seven')
  {
     //dist = (Math.round((c.maxh - currh) / DDSPEED));
	 c.style.top = '83px';
  }
  else{
	  
	  
	    	  
		if (browserName == 'msie' || browserName == 'firefox') {
			  c.style.top = parseInt(c.style.top.replace('px','')) - parseInt(dist * d) + 'px';
		}
		else
		{
			//c.style.top = '-100px';
			c.style.top = - c.offsetHeight + 'px';
		}

  
 }
  c.style.height = currh + (dist * d) + 'px';
  //c.style.opacity = currh / c.maxh;
  c.style.opacity = (currh-15) / 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);
  }
}