Agent=window.navigator.userAgent;
isIE=document.all?true:false;
isW3CDOM=document.getElementById?true:false;
isOpera=Agent.indexOf("Opera")==-1?false:true;
isNN4x=(Agent.indexOf("/4.")&&!isIE&&!isOpera&&!isW3CDOM)?true:false;

function Defined(vrbl)
{
	var str_Undefined="undefined"
	var str_Empty="";
	var str_Null="null";
	
	if(typeof(vrbl)==str_Undefined||(str_Empty+vrbl)==str_Undefined||vrbl==null||(str_Empty+vrbl)==str_Null||(str_Empty+vrbl)==str_Empty)return false;
	else return true;
}
function GetObjectByID(id)
{
	if(isIE)return document.all[id];
	if(isW3CDOM)return document.getElementById(id);
	return null;
}
function GetLayer(layerName)
{
	if(isIE)return document.all[layerName].style;
	if(isW3CDOM)return document.getElementById(layerName).style;
	if(isNN4x)return document.layers[layerName];
	return null;
}



var ActiveLayer, ActiveMenuNumber;
function ViewActiveLayer(type)
{
	if(ActiveLayer)if(type)
	{
		if(isW3CDOM&&!isIE&&!isOpera)
		{
			wdth=GetObjectByID("width");
			ActiveLayer.width=wdth.offsetWidth;
		}
		ActiveLayer.top=194;
		ActiveLayer.visibility="visible";
	}
	else
	{
		ActiveLayer.visibility="hidden";
	}
}
function HilightMenuElement(prefix, bg1, bg2, num)
{
	base=GetObjectByID(prefix+num);
	base2=GetObjectByID(prefix+(num-1)+""+num);

	if(ActiveMenuNumber)
	{
		oldbase=GetObjectByID(prefix+ActiveMenuNumber);
		oldbase2=GetObjectByID(prefix+(ActiveMenuNumber-1)+""+ActiveMenuNumber);

		if(oldbase)oldbase.setAttribute("background", bg2);
		if(oldbase2)oldbase2.setAttribute("background", bg2);
	}
	if(base)base.setAttribute("background", bg1);
	if(base2)base2.setAttribute("background", bg1);
}
function HilightMenu(num)
{
	if(isOpera)return;

	HilightMenuElement("backgrount", "images/bg4.gif", "images/bg3.gif", num);
	HilightMenuElement("underline", "images/underline2.gif", "images/underline1.gif", num);

	left=GetObjectByID("image"+(num-1)+""+num);
	right=GetObjectByID("image"+num+""+(num+1));
	if(left&&right)
	{
		if(ActiveMenuNumber)
		{
			oldleft=GetObjectByID("image"+(ActiveMenuNumber-1)+""+ActiveMenuNumber);
			oldright=GetObjectByID("image"+ActiveMenuNumber+""+(ActiveMenuNumber+1));

			if(oldleft&&oldright)
			{
				oldleft.src=oldleft.src.substr(oldleft.src.length-9,4)=="left"?"images/left1.gif":"images/separator.gif";
				if(oldright.src.substr(oldright.src.length-10,5)=="right")
				{
					oldright.src="images/right1.gif";
					HilightMenuElement("backgrount", "images/bg3.gif", "images/bg3.gif", ActiveMenuNumber+1);
					HilightMenuElement("underline", "images/underline1.gif", "images/underline1.gif", ActiveMenuNumber+1);
				}
				else oldright.src="images/separator.gif"
			}
		}
		
		left.src=left.src.substr(left.src.length-9,4)=="left"?"images/left2.gif":"images/separator2.gif";
		if(right.src.substr(right.src.length-10,5)=="right")
		{
			right.src="images/right2.gif";
			HilightMenuElement("backgrount", "images/bg4.gif", "images/bg3.gif", num+1);
			HilightMenuElement("underline", "images/underline2.gif", "images/underline1.gif", num+1);
		}
		else right.src="images/separator3.gif"
	}
}
function MenuClick(num, objct, force)
{
	if(!isIE&&!isW3CDOM&&!isNN4x)return true;
//	if(ActiveMenuNumber==num)location.href=objct.href;
//	else
	{
		HilightMenu(num);

		layerName="menu"+num;
		ViewActiveLayer(false);
		ActiveLayer=GetLayer(layerName);
		ActiveMenuNumber=num;
		if(force)return true;
		ViewActiveLayer(true);
	}
	return false;
}
function SecondMenuClick(MenuID)
{
	if(isNN4x)return false;

	menu=GetObjectByID("Menu2_"+MenuID);
	if(!Defined(menu))return true;
	menu.style.display=menu.style.display=='block'?'none':'block';

	return false;
}