// JavaScript Document
function dummyheight()
{
  var myWidth = 0, myHeight = 0;
  if( typeof( window.innerWidth ) == 'number' ) {
    //Non-IE
    myWidth = window.innerWidth;
    myHeight = window.innerHeight;
  } else if( document.documentElement &&
      ( document.documentElement.clientWidth || document.documentElement.clientHeight ) ) {
    //IE 6+ in 'standards compliant mode'
    myWidth = document.documentElement.clientWidth;
    myHeight = document.documentElement.clientHeight;
  } else if( document.body && ( document.body.clientWidth || document.body.clientHeight ) ) {
    //IE 4 compatible
    myWidth = document.body.clientWidth;
    myHeight = document.body.clientHeight;
  }
  //window.alert( 'Width = ' + myWidth );
  //window.alert( 'Height = ' + myHeight );
  
  ergebnis=Math.floor((myHeight-600)/2);
  if (ergebnis<0) {return 0} else {return ergebnis}
}
function dummysaktualisieren()
{
	//Netscape4 Reload
	if ((navigator.appName=="Netscape")&&(parseInt(navigator.appVersion)==4))
	{
		//location.reload();
		history.go(0);
	}
	else 
	{ //Others: resize dummies
		document.dummytop.height=dummyheight();
		document.dummybottom.height=dummyheight();
		dummytop.height=dummyheight();
		dummybottom.height=dummyheight();
	}
}

window.onresize = dummysaktualisieren;
// -------------------------------------------------------