if (document.images) {
  var outbut1 = new Image(); outbut1.src = 'pics/1_1.gif';
  var overbut1 = new Image(); overbut1.src = 'pics/1_2.gif';
  var upbut1 = new Image(); upbut1.src = 'pics/1_2.gif';
  var downbut1 = new Image(); downbut1.src = 'pics/1_3.gif';

  var outbut2 = new Image(); outbut2.src = 'pics/2_1.gif';
  var overbut2 = new Image(); overbut2.src = 'pics/2_2.gif';
  var upbut2 = new Image(); upbut2.src = 'pics/2_2.gif';
  var downbut2 = new Image(); downbut2.src = 'pics/2_3.gif';

  var outbut3 = new Image(); outbut3.src = 'pics/3_1.gif';
  var overbut3 = new Image(); overbut3.src = 'pics/3_2.gif';
  var upbut3 = new Image(); upbut3.src = 'pics/3_2.gif';
  var downbut3 = new Image(); downbut3.src = 'pics/3_3.gif';

  var outbut4 = new Image(); outbut4.src = 'pics/4_1.gif';
  var overbut4 = new Image(); overbut4.src = 'pics/4_2.gif';
  var upbut4 = new Image(); upbut4.src = 'pics/4_2.gif';
  var downbut4 = new Image(); downbut4.src = 'pics/4_3.gif';

  var outbut5 = new Image(); outbut5.src = 'pics/5_1.gif';
  var overbut5 = new Image(); overbut5.src = 'pics/5_2.gif';
  var upbut5 = new Image(); upbut5.src = 'pics/5_2.gif';
  var downbut5 = new Image(); downbut5.src = 'pics/5_3.gif';

  var outbut6 = new Image(); outbut6.src = 'pics/6_1.gif';
  var overbut6 = new Image(); overbut6.src = 'pics/6_2.gif';
  var upbut6 = new Image(); upbut6.src = 'pics/6_2.gif';
  var downbut6 = new Image(); downbut6.src = 'pics/6_3.gif';

  var outbut7 = new Image(); outbut7.src = 'pics/7_1.gif';
  var overbut7 = new Image(); overbut7.src = 'pics/7_2.gif';
  var upbut7 = new Image(); upbut7.src = 'pics/7_2.gif';
  var downbut7 = new Image(); downbut7.src = 'pics/7_3.gif';
}

function turnOff1(imgName) {
  if (document.images) 
    document[imgName + "p"].src = eval('out' + imgName + '.src')
}

function turnOn1(imgName) {
  if (document.images) 
    document[imgName + "p"].src = eval('over' + imgName + '.src')
}

function turnOff(imgName) {
  if (document.images)
    document[imgName + "p"].src = eval('up' + imgName + '.src')
}

function turnOn(imgName) {
  if (document.images) 
    document[imgName + "p"].src = eval('down' + imgName + '.src')
}