// JavaScript Document
var DDSPEED = 10;
var DDTIMER = 15;

// main function to handle the mouse events //
function ddMenu(id,d){
  var h = document.getElementById('NavHeader' + id);
  var c = document.getElementById('NavContent' + id);
  clearInterval(c.timer); //取消由 setInterval() 设置的 timeout
  if(d==0)
  { 
      clearTimeout(h.timer);
      if(c.offsetHeight < c.maxh)
        c.timer = setInterval(function(){ddSlide(c,1)},DDTIMER);
  }
  else if(d == 1){
      clearTimeout(h.timer); //取消由 setInterval() 设置的 timeout
    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);//按照指定的周期（以毫秒计）来调用函数或计算表达式
  }else{
    h.timer = setTimeout(function(){ddCollapse(c)},50);//按照指定的周期（以毫秒计）来调用函数或计算表达式
  }

}

// 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('NavHeader' + id);
  var c = document.getElementById('NavContent' + id);
  clearInterval(c.timer);
  clearTimeout(h.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);
  }
}


//get or blur the input focus:
function onInputFocus(objStr)
{
   //objStr = document.getElementById(obj);
   if( objStr.value==objStr.title )
   {
      objStr.value = "";
      //obj.className = "inputSomething";
   }
}
function onInputBlur(objStr)
{
//objStr = document.getElementById(obj);
   if( objStr.value=="")
   {
      objStr.value = objStr.title;
      //obj.className = "inputNothing";
   }
}
function GetObj(objName)
{
	if(document.getElementById)
		return eval('document.getElementById("' + objName + '")');
	else if(document.layers)
		return eval("document.layers['" + objName +"']");
	else
		return eval('document.all.' + objName);
}
function TabChange(index,flag)
{
    if( GetObj("tabPage" + flag + "_"+index).className == 'tabActive' )
        return;
	for(var i=0;i<15;i++)
	{
		if(GetObj("tabContent" + flag + "_" + i)&&GetObj("tabPage" + flag + "_"+i))
		{
			GetObj("tabPage" + flag + "_"+i).className = i==index ? 'tabActive' : '';
			GetObj("tabContent" + flag + "_"+i).style.display = i==index ? 'block' : 'none';
			continue;
		}
		break;
	}
}