// Zugbewegung, Copyright: Lutz Eckner, Reichenbach
var a;
var breite;

function abfrage ()
{
  if (navigator.appName=='Netscape' && navigator.appVersion.charAt(0)>='4')
     {
       //breite=screen.width;
       breite=360;
       a=breite+20;
       window.setTimeout ('vornc()', 20);
     }
  if (navigator.appName=='Microsoft Internet Explorer' && navigator.appVersion.charAt(0)>='4')
     {
       breite=360;
       a=breite+20;
       window.setTimeout ('vorie()', 20);
     }
}
function vornc()
 {
//  für NC ab Version 4
  if (a>=-280)
    {
        a-=5;
        window.document.zug1.left=a;
        window.document.zug1.top=101;
          window.setTimeout ('vornc()', 20);
    }
  else
    {
       window.setTimeout ('ruecknc()', 5000);
    }
}
function ruecknc()
{
  if (a<=breite)
    {
        a+=5;
        window.document.zug2.left=a;
        window.document.zug2.top=101;
        window.setTimeout ('ruecknc()', 20);
    }
  else
    {
       window.setTimeout ('vornc()', 5000)
    }
}
function vorie()
{
//  für IE ab Version 4
  if (a>=-280)
    {
        a-=5;
        zug1.style.left=a;
        zug1.style.top=101;
          window.setTimeout ('vorie()', 20);
    }
  else
    {
       window.setTimeout ('rueckie()', 5000);
    }
}
function rueckie()
{
  if (a<=breite)
    {
        a+=5;
        zug2.style.left=a;
        zug2.style.top=101;
        window.setTimeout ('rueckie()', 20);
                                  }
  else
    {
       window.setTimeout ('vorie()', 5000)
    }
}