var ie = document.all ? 1 : 0;
var ns = document.layers ? 1 : 0;
var mac = ((navigator.appVersion.indexOf("Mac") != -1)) ? 1 : 0;
var pc = ((navigator.appVersion.indexOf("Mac") == -1)) ? 1 : 0;

var frTop=0;
var scTimer;

function Scroll(fps)
  {
  if (ie)
    {
    var scHeight = document.all["imgContent"].offsetHeight;
    var frHeight = 225;
    }
  else
    {
    var scHeight = document.contentFrame.document.layers["imgContent"].document.height;
    var frHeight = 225;    
    }
  var scMin=0;
  var scMax=scHeight-frHeight;
  if (frTop<0) {frTop=0; fps=0;} 
  if (frTop>scMax) {frTop=scMax; fps=0;}
  frTop+=fps;
  if (fps!=0)
    {
    if (ie)
      {
      document.all["imgContent"].style.top = -frTop;
      }
    else
      {      
      document.layers["contentFrame"].document.layers["imgContent"].top = -frTop;
      }
    scTimer = setTimeout("Scroll("+fps+")", 10);
    }
  }

function stopScroll()
  {
  clearTimeout(scTimer);
  }