dropDownMenu.Registry = [];
dropDownMenu.aniLen = 850;
dropDownMenu.hideDelay = 400;
dropDownMenu.minCPUResolution = 10;

function dropDownMenu(id, dir, left, top, width, height, vimg_id)
{
	this.ie = document.all ? 1 : 0;
	this.ns4 = document.layers ? 1 : 0;
	this.dom = document.getElementById ? 1 : 0;
	if (this.ie || this.ns4 || this.dom)
	{
		this.id = id;
		this.dir = dir;
		this.orientation = dir == "left" || dir == "right" ? "h" : "v";
		this.dirType = dir == "right" || dir == "down" ? "-" : "+";
		this.dim = this.orientation == "h" ? width : height;
		this.hideTimer = false;
		this.aniTimer = false;
		this.open = false;
		this.over = false;
		this.startTime = 0;
		this.gRef = "dropDownMenu_"+id;
		this.vimg_id = vimg_id;
		eval(this.gRef+"=this");
		dropDownMenu.Registry[id] = this;
		var d = document;
		d.write('<style type="text/css">');
		d.write('#' + this.id + 'Container { visibility:hidden; ');
		d.write('left:' + left + 'px; ');
		d.write('top:' + top + 'px; ');
		d.write('overflow:hidden; }');
		d.write('#' + this.id + 'Container, #' + this.id + 'Content { position:absolute; ');
		d.write('width:' + width + 'px; ');
		d.write('height:' + height + 'px; ');
		d.write('clip:rect(0 ' + width + ' ' + height + ' 0); ');
		d.write('}');
		d.write('</style>');
		this.load();
	}
}

dropDownMenu.prototype.load = function()
{
	var d = document;
	var lyrId1 = this.id + "Container";
	var lyrId2 = this.id + "Content";
	var obj1 = this.dom ? d.getElementById(lyrId1) : this.ie ? d.all[lyrId1] : d.layers[lyrId1];
	
	if (obj1)
	{
		var obj2 = this.ns4 ? obj1.layers[lyrId2] : this.ie ? d.all[lyrId2] : d.getElementById(lyrId2);
	}
		
	var temp;
	
	if (!obj1 || !obj2)
	{
		window.setTimeout(this.gRef + ".load()", 100);
	}
	else
	{
		this.container = obj1;
		this.menu = obj2;
		this.style = this.ns4 ? this.menu : this.menu.style;
		this.homePos = eval("0" + this.dirType + this.dim);
		this.outPos = 0;
		this.accelConst = (this.outPos - this.homePos) / dropDownMenu.aniLen / dropDownMenu.aniLen;
		if (this.ns4)
		{
			this.menu.captureEvents(Event.MOUSEOVER | Event.MOUSEOUT);
		}
		this.menu.onmouseover = new Function("dropDownMenu.showMenu('" + this.id + "')");
		this.menu.onmouseout = new Function("dropDownMenu.hideMenu('" + this.id + "');menu_off("+this.vimg_id+");");
		this.endSlide();
	}
};

dropDownMenu.showMenu = function(id)
{
	window.status = id;
	var reg = dropDownMenu.Registry;
	var obj = dropDownMenu.Registry[id];
	if (obj.container)
	{
		obj.over = true;
		
		for (menu in reg)
		{
			if (id != menu)
			{
				dropDownMenu.hide(menu);
			}
		}
			
		if (obj.hideTimer)
		{
			reg[id].hideTimer = window.clearTimeout(reg[id].hideTimer);
		}
		
		if (!obj.open && !obj.aniTimer)
		{
			reg[id].startSlide(true);
		}
	}
};

dropDownMenu.hideMenu = function(id)
{
	var obj = dropDownMenu.Registry[id];
	if (obj.container)
	{
		if (obj.hideTimer)
		{
			window.clearTimeout(obj.hideTimer);
		}
		obj.hideTimer = window.setTimeout("dropDownMenu.hide('" + id + "')", dropDownMenu.hideDelay);
	}
};

dropDownMenu.hide = function(id)
{
	var obj = dropDownMenu.Registry[id];
	obj.over = false;
	
	if (obj.hideTimer)
	{
		window.clearTimeout(obj.hideTimer);
	}
		
	obj.hideTimer = 0;
	
	if (obj.open && !obj.aniTimer)
	{
		obj.startSlide(false);
	}
};

dropDownMenu.prototype.startSlide = function(open)
{
	this.open = open;
	if (open)
	{
		this.setVisibility(true);
	}
	this.startTime = (new Date()).getTime();
	this.aniTimer = window.setInterval(this.gRef + ".slide()", dropDownMenu.minCPUResolution);
};

dropDownMenu.prototype.slide = function()
{
	var elapsed = (new Date()).getTime() - this.startTime;
	if (elapsed > dropDownMenu.aniLen)
	{
		this.endSlide();
	}
	else
	{
		var d = Math.round(Math.pow(dropDownMenu.aniLen-elapsed, 2) * this.accelConst);
		if (this.open && this.dirType == "-")
		{
			d = -d;
		}
		else if (this.open && this.dirType == "+")
		{
			d = -d;
		}
		else if (!this.open && this.dirType == "-")
		{
			d = -this.dim + d;
		}
		else
		{
			d = this.dim + d;
		}
		this.moveTo(d);
	}
};

dropDownMenu.prototype.endSlide = function()
{
	this.aniTimer = window.clearTimeout(this.aniTimer);
	this.moveTo(this.open ? this.outPos : this.homePos);
	
	if (!this.open)
	{
		this.setVisibility(false);
	}
	
	if ((this.open && !this.over) || (!this.open && this.over))
	{
		this.startSlide(this.over);
	}
};

dropDownMenu.prototype.setVisibility = function(bShow)
{ 
	var s = this.ns4 ? this.container : this.container.style;
	s.visibility = bShow ? "visible" : "hidden";
};

dropDownMenu.prototype.moveTo = function(p)
{ 
	this.style[this.orientation == "h" ? "left" : "top"] = p;
};

dropDownMenu.prototype.getPos = function(c)
{
	return parseInt(this.style[c], 10);
};

var menus = [
	// drowdown menus for admin navigation
	new dropDownMenu("menu1", "down", 55,  87, 125, 300),
	new dropDownMenu("menu2", "down", 122, 87, 250, 250),
	new dropDownMenu("menu3", "down", 218, 87, 150, 250),
	new dropDownMenu("menu4", "down", 308, 87, 150, 250),
	new dropDownMenu("menu5", "down", 385, 87, 150, 250),		
	new dropDownMenu("menu6", "down", 470, 87, 370, 450)

];

for (var i = 0; i < menus.length; i++) {
	menus[i].onactivate = new Function("document.getElementById('act" + i + "').className='active';");
	menus[i].ondeactivate = new Function("document.getElementById('act" + i + "').className='';");
}