if (document.images) {
  ionl = new Image();
  ionl.src='/i/butOnL.gif';
  ionr = new Image();
  ionr.src='/i/butOnR.gif';
  il = new Image();
  il.src='/i/butL.gif';
  ir = new Image();
  ir.src='/i/butR.gif';
}

function up(A, B, C, D) {
 if (document.images) { 
   document[A].src = ionl.src;
   document[B].src = ionr.src;
 }
 toggleOriginal(C, D);
}

function down(A, B, C, D)  {
  if (document.images) { 
    document[A].src = il.src; 
    document[B].src = ir.src;  
  }
  toggleOriginal(C, D);
}
	   
function toggleOriginal(Y, Z)
{
  try {document.getElementById(Y).setAttribute("id", "butOnBg");
    document.getElementById(Z).setAttribute("id", "butOnC");
  }
  catch(e) {
    document.getElementById("butOnBg").setAttribute("id", Y); 
    document.getElementById("butOnC").setAttribute("id", Z);
  }
}     

function trim(str) {
  return str.replace(/^\s*/,'').replace(/\s*$/,'');
}