var isIMG = document.images;
var Arrowon;
var Arrowoff;
var Upon;
var Upoff;

if (isIMG) {
   Arrowon = new Image(19,19);
   Arrowon.src = "images/turn.gif";
   Arrowoff = new Image(19,19);
   Arrowoff.src = "images/turn2.gif";
   Upon = new Image(19,19);
   Upon.src = "images/up2.gif";
   Upoff = new Image(19,19);
   Upoff.src = "images/up.gif";
Downon = new Image(15,16);
   Downon.src = "images/down2.gif";
   Downoff = new Image(15,16);
   Downoff.src = "images/down.gif";	
 }

function Arrow(Arrowname) {

   if (isIMG) {
     document[Arrowname].src = (document[Arrowname].src.indexOf('turn2.gif') != -1) ? 'images/turn.gif' : 'images/turn2.gif';

   }
}

function Up(Upname) {

   if (isIMG) {
     document[Upname].src = (document[Upname].src.indexOf('up2.gif') != -1) ? 'images/up.gif' : 'images/up2.gif';

   }
}

function Down(Downname) {

   if (isIMG) {
     document[Downname].src = (document[Downname].src.indexOf('down2.gif') != -1) ? 'images/down.gif' : 'images/down2.gif';

   }
}

function Downb(Downbname) {

   if (isIMG) {
     document[Downbname].src = (document[Downbname].src.indexOf('down2.gif') != -1) ? 'images/down.gif' : 'images/down2.gif';

   }
}

function Downc(Downcname) {

   if (isIMG) {
     document[Downcname].src = (document[Downcname].src.indexOf('down2.gif') != -1) ? 'images/down.gif' : 'images/down2.gif';

   }
}

function Downd(Downdname) {

   if (isIMG) {
     document[Downdname].src = (document[Downdname].src.indexOf('down2.gif') != -1) ? 'images/down.gif' : 'images/down2.gif';

   }
}