var navState = 0;
var sn = null;

function makeObj(name) {
  if(document.getElementById) return document.getElementById(name).style;
  else if(document.all) return eval('document.all.' + name + '.style');
  else if(document.layers) return eval('document.' + name);
  return null;
}

function setImage(lay,name,img) {
  if(document.layers) 
  	  eval('document.' + lay + '.document.images.' + name + '.src = img');
  else if(document.images)
	  document.images[name].src = img;	  
  return 1;
}

function toggleNavigation() {
  var where2;
  if(sn == null) {
    sn = makeObj('Navigation');
    if(sn == null) return 0;
  }
  navState = 1 - navState;
  if(navState == 0) {
    where2 = -150;
  } else {
    where2 = 20;
  }
  if(sn.left != null) { if(String(sn.left).indexOf('px') > -1) sn.left = where2 + 'px'; else sn.left = where2; }
  if(sn.pixelLeft != null) sn.pixelLeft = where2;
  return 1;
}

function hl(name) {
  var row = makeObj('NavR'+name);
  var lnk = makeObj('NavL'+name);
  if((row == null) || (lnk == null)) return 0;
  row.backgroundColor = 'yellow';
  lnk.color = 'black';
  return 1;
}

function unhl(name) {
  var row = makeObj('NavR'+name);
  var lnk = makeObj('NavL'+name);
  if((row == null) || (lnk == null)) return 0;
  row.backgroundColor = 'black';
  lnk.color = 'white';
  return 1;
}