var showedMenu=new Array();//正在显示的各级菜单
/*
显示菜单
menuId：菜单对象标识符
level：菜单的级别
*/
function showMenu(obj,menuId,level)
{
	var e,x,y;
	var sel;
	if(document.all)
	{
		e=event.srcElement;
		if(level==0)
		{//子菜单在下方
			x=0;
			y=e.offsetHeight;
		}
		else
		{//子菜单在右侧
			x=e.offsetWidth;
			y=0;
		}
		while(e)
		{//计算子菜单绝对坐标
			x+=e.offsetLeft;
			y+=e.offsetTop;
			e=e.offsetParent;
		}
		
		sel=document.all.tags("SELECT");
		
		//对于IE5.0以前的版本进行调整
		if (navigator.appVersion.indexOf("MSIE") != -1) 
		{
			var IEmajorStart = navigator.appVersion.indexOf("MSIE") + 4;
			var IEmajorEnd = (IEmajorStart + 6);
			var theMajor = navigator.appVersion.substring(IEmajorStart, IEmajorEnd);
			if(parseFloat(theMajor)<5.5)y+=4;
		}
		y=y-3; //调整菜单显示的高度
	}
	else 
	{
		e=obj;
		if(level==0)
		{//子菜单在下方
			x=0;
			y=e.offsetHeight;
		}
		else
		{//子菜单在右侧
			x=e.offsetWidth;
			y=0;
		}
		while(e)
		{//计算子菜单绝对坐标
			x+=e.offsetLeft;
			y+=e.offsetTop;
			e=e.offsetParent;
		}
		sel=document.getElementsByTagName("SELECT");
		y=y-1; //调整菜单显示的高度
	}
	hideMenuTruely(level);
	
	showedMenu[level]=document.getElementById(menuId);
	if(showedMenu[level])
	{
		for(var i=0;i<sel.length;i++)if(overlapObjs(sel[i],showedMenu[level]))sel[i].style.visibility='hidden';
		showedMenu[level].style.left=x+'px';
		showedMenu[level].style.top=y+'px';
		showedMenu[level].style.visibility='visible';
	}
}

/*
隐藏菜单（先判断条件）
topLevel：要隐藏的菜单最高级别
*/
function hideMenu(e)
{
	var topLevel=0;
	if(!mouseOverObj(e,topLevel+1)&&!mouseOverObj(e,topLevel))
	{
		hideMenuTruely(topLevel);
		for(var i=topLevel-1;i>=0;i--)if(!mouseOverObj(i))hideMenuTruely(i);
	}
}
/*
真正隐藏菜单（无条件）
topLevel：要隐藏的菜单最高级别
*/
function hideMenuTruely(topLevel)
{
	for(level=topLevel;showedMenu[level];level++)
	{
		showedMenu[level].style.visibility='hidden';
		showedMenu[level]=null;
	}
	if(topLevel==0)
	{
		var sel=document.getElementsByTagName("SELECT");
		for(var i=0;i<sel.length;i++)sel[i].style.visibility='visible';
	}
}

/*
判断鼠标当前位置是否在菜单范围内，如果是则返回true
level：菜单的层
*/
function mouseOverObj(e, level)
{
	var obj=showedMenu[level];
	if(!obj)return false;
	var x=0;
	var y=0;
	if(document.all)
	{
		x=event.clientX+objHTMLbody.scrollLeft;
		y=event.clientY+objHTMLbody.scrollTop;
		return !(x<obj.offsetLeft+2||x>obj.offsetLeft+obj.offsetWidth||y<obj.offsetTop+2||y>obj.offsetTop+obj.offsetHeight);
	}
	else
	{
		x=e.pageX;
		y=e.pageY;
		var currentLeft = 0;
		var currentTop = 0;
		var currentWidth = obj.offsetWidth;
		var currentHeight = obj.offsetHeight;
		while(obj)
		{//计算子菜单绝对坐标
			currentLeft+=obj.offsetLeft;
			currentTop+=obj.offsetTop;
			obj=obj.offsetParent;
		}
		return !(x<=currentLeft||x>=currentLeft+currentWidth||y<=currentTop||y>=currentTop+currentHeight);
	}

	
}

/*
判断两个对象是否重叠，如果是则返回true
e1,e2：两个对象
*/
function overlapObjs(e1,e2)
{
	var l1=u1=0;
	var r1=e1.offsetWidth;
	var d1=e1.offsetHeight;
	while(e1)
	{//计算绝对坐标
		l1+=e1.offsetLeft;
		u1+=e1.offsetTop;
		e1=e1.offsetParent;
	}
	r1+=l1;
	d1+=u1;

	var l2=u2=0;
	var r2=e2.offsetWidth;
	var d2=e2.offsetHeight;
	while(e2)
	{//计算绝对坐标
		l2+=e2.offsetLeft;
		u2+=e2.offsetTop;
		e2=e2.offsetParent;
	}
	r2+=l2;
	d2+=u2;
	return !(d1<u2||d2<u1||r1<l2||r2<l1);
}

function scrollit(seed)
{
  var msg=scroll_message;
  var out = " ";
  var c   = 1;
  if (seed > 100)
  {
    seed--;
    cmd="scrollit("+seed+")";
    timerTwo=window.setTimeout(cmd,100);
  }
  else if (seed <= 100 && seed > 0)
  {
    for (c=0 ; c < seed ; c++)out+=" ";
    out+=msg;
    seed--;
    window.status=out;
    cmd="scrollit("+seed+")";
    timerTwo=window.setTimeout(cmd,100);
  }
  else if (seed <= 0)
  {
    if (-seed < msg.length)
    {
      out+=msg.substring(-seed,msg.length);
      seed--;
      window.status=out;
      cmd="scrollit("+seed+")";
      timerTwo=window.setTimeout(cmd,100);
    }
    else
    {
      window.status=" ";
      timerTwo=window.setTimeout("scrollit(100)",75);
    }
  }
}