var sNavName = String(navigator.userAgent); 
var bType = 0;

if (sNavName.indexOf('MSIE') != -1) bType=1;
if (sNavName.indexOf('Opera') != -1) bType=2;
if (sNavName.indexOf('Netscape') != -1) bType=3;
if (sNavName.indexOf('Mozilla') != -1) bType=3;

var loaded  = false;
var visible = false;
var sDivName= "Layer";
var sImgName= "a";

function getPosX(obj)
{ 
  if (!obj) return 0; 
  return (obj.offsetLeft + getPosX(obj.offsetParent)); 
}

function getPosY(obj)
{
  if (!obj) return 0;
  return (obj.offsetTop + getPosY(obj.offsetParent));
}

function enableMenu()
{
if (bType == 1 || bType == 2 || bType == 3 ) loaded = true; 
}

function showMenu(id, event, imgsrc)
{    


    if (visible==id)return false;   
    if (document.getElementById && loaded)
    {

      if (bType==1 || bType==2 ){

        var obj = document.getElementById(sDivName+id);
        var img = document.getElementById(sImgName+id);
 
        imgdef = img.src


     	if (! (obj && img)) return;            
       

          obj.style.left = getPosX(img);
          obj.style.top  = getPosY(img)-44;

      }


      else {

      var obj = document.getElementById(sDivName+id);
      var img = document.getElementById(sImgName+id);
      if (! (obj && img)) return;            

       obj.style.left = getPosX(img)-1;
       obj.style.top  = getPosY(img)+28;

       imgdef = img.src
       
       img.src = imgsrc


      }


          hideMenu(visible);
	  obj.style.visibility = 'visible';
	  visible=id;

          event.cancelBubble = true;
          return true;



    }
}


function hideAll(event)
{    
    if (! (document.getElementById && loaded))return;
    var i=1;
	while (true)
	{
		if (document.getElementById) 
		{
			var obj = document.getElementById(sDivName+i);
			if (obj) 
			{ 
			    obj.style.visibility = 'hidden';
			    ++i;
			} 
			else return;
		} else break;
	}
    visible=false;
}

function hideMenu(id, event)
{



    if (! (document.getElementById && loaded))return;
	if (document.getElementById && visible)
	{
        var divName= sDivName+id;
        var obj    = document.getElementById(divName);
        var img = document.getElementById(sImgName+id);
        var toObj  = null;

        switch(bType)
        {
			case 1: toObj = event.toElement; break;
            case 2: toObj = event.relatedTarget; break;
		}

		if (toObj != null)
		{
	        var p= toObj.parentElement;
    	    while (p)
	        {
    	    	if (p.id == divName) return;
        		p = p.parentElement;
	        }
		}

		if (obj)
        {
            obj.style.visibility = 'hidden';


              img.src = imgdef


            visible=false;
        }
	}

}