var cur_img_name = "a1";
var bType = "unknown";
var bName = navigator.appName;
var bVer  = parseInt(navigator.appVersion);

if      (bName == "Netscape" && bVer >= 3) bType = "n3";
else if (bName == "Microsoft Internet Explorer" && bVer >= 4) bType = "n3";
else if (bName == "Netscape" && bVer == 2) bType = "n2";
else if (bName == "Microsoft Internet Explorer" && bVer == 3) bType = "e3";

// preload universal images:

if (bType == 'n3')
{
   a1_n = new Image(136,14);
   a1_n.src = "images/menu/1.gif";
   a1_h = new Image(136,14);
   a1_h.src = "images/menu/1a.gif";
   a1_s = new Image(136,14);
   a1_s.src = "images/menu/1a.gif";
 
   a2_n = new Image(136,14);
   a2_n.src = "images/menu/2.gif";
   a2_h = new Image(136,14);
   a2_h.src = "images/menu/2a.gif";
   a2_s = new Image(136,14);
   a2_s.src = "images/menu/2a.gif";

   a3_n = new Image(136,14);
   a3_n.src = "images/menu/3.gif";
   a3_h = new Image(136,14);
   a3_h.src = "images/menu/3a.gif";
   a3_s = new Image(136,14);
   a3_s.src = "images/menu/3a.gif";

   a4_n = new Image(136,14);
   a4_n.src = "images/menu/4.gif";
   a4_h = new Image(136,14);
   a4_h.src = "images/menu/4a.gif";
   a4_s = new Image(136,14);
   a4_s.src = "images/menu/4a.gif";

   a5_n = new Image(136,14);
   a5_n.src = "images/menu/5.gif";
   a5_h = new Image(136,14);
   a5_h.src = "images/menu/5a.gif";
   a5_s = new Image(136,14);
   a5_s.src = "images/menu/5a.gif";
   
   a6_n = new Image(136,14);
   a6_n.src = "images/menu/6.gif";
   a6_h = new Image(136,14);
   a6_h.src = "images/menu/6a.gif";
   a6_s = new Image(136,14);
   a6_s.src = "images/menu/6a.gif";   
   
}

function hiLite(imgDocID,imgObjName) {

// manages mouseOver animations
//   imgDocID - the name or number of the document image to be replaced
//   imgObjName - the name of the image object to be swapped in

   if (bType == 'n3') 
   {
      if (imgDocID != cur_img_name)
      {
         document.images[imgDocID].src = eval(imgObjName + ".src")
      }
   }
}

function set_active(imgDocID,imgObjName)
{
   if (bType == "n3")
   {
      if (cur_img_name != "")
      {
         document.images[cur_img_name].src = eval(cur_img_name + "_n.src")
      }
      cur_img_name = imgDocID;
      document.images[imgDocID].src = eval(imgObjName + ".src")
   }
}

function check()
{
	if (document.forms[0].emailadres.value == "")
	{
	alert("Graag eerst uw emailadres invullen.")
	document.forms[0].emailadres.focus(); 
	return false;
	}
return true;
}