function PopUp(URL,popupname,b,h,scrollbars) {
	var PopUpName = popupname || 'PopUp';
	var breite = b || 410;
	var hoehe = h || 450;
	var ScrollBars = scrollbars || 'auto';
	var xPos = (screen.availWidth - breite) / 2
	var yPos = (screen.availHeight - hoehe ) / 2
	var fenster = window.open(URL,PopUpName,'width='+breite+',height='+hoehe+',scrollbars='+ScrollBars+',toolbar=no,menubar=no,screenX='+xPos+',screenY='+yPos+',left='+xPos+',top='+yPos)
	fenster.focus();
}

function mover(obj) {
	obj.src=obj.src.replace(/_off/,"_mo");
}
function mout(obj) {
	obj.src=obj.src.replace(/_mo/,"_off");
}
function setblurtoallas() {
    if(document.getElementsByTagName) {
        as = document.getElementsByTagName("a");
        l = as.length;
        for(i=0; i < l; i++) {
            as[i].onfocus = _blur;
        }
    }
}
var popUpWin=0;
function popUpWindow(URLStr, Fenstername, width, height)
{
  if(popUpWin)
  {
    if(!popUpWin.closed) popUpWin.close();
  }
  popUpWin = open(URLStr, Fenstername, 'toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=no,copyhistory=yes,width='+width+',height='+height+'');
}
function _blur() {
    this.blur();
}

function changeNavi(nav)
{
  if (document.forms.picGet) {
    checkNav = parseInt( document.forms['picGet'].pic.value );
    anzPics  = parseInt( document.forms['picGet'].anz.value );
  } else {
    checkNav = 0;
    anzPics  = 0;
  }
  if (anzPics != 0) {
	  if( nav == 'prev' && checkNav > 1 )
	  {
	    nav = checkNav-1;
	  }
	  else if( nav == 'prev' && checkNav == 1 )
	  {
	    nav = anzPics;
	  }
	  else if( nav == 'next' && checkNav < anzPics )
	  {
	    nav = checkNav+1;
	  }
	  else if( nav == 'next' && checkNav == anzPics )
	  {
	    nav = 1;
	  }

	  // alles aus
	  for (var i = 1; i <= anzPics+3; ++i)
	  {
	    document.getElementById('button'+i).style.display      = "none";
	  }

	  // irgendetwas falsch definiert oder ueberhaupt alles doof?
	  if(nav == NaN || nav == undefined || nav > anzPics )
	  {
	    // das letzte
	    nav = checkNav;
	  }

	  for (var j = nav; j < nav+4; ++j)
	  {
	    document.getElementById('button'+j).style.display      = "inline";
	  }

	  // merkwert schreiben
	  document.forms['picGet'].pic.value = nav;
	}
}