function changePic()
{
	var anz=8;
	pics=new Array(anz);
	pics[0]="images/head_01.jpg";
	pics[1]="images/head_02.jpg";
	pics[2]="images/head_03.jpg";
	pics[3]="images/head_04.jpg";
	pics[4]="images/head_05.jpg";
	pics[5]="images/head_06.jpg";	
	pics[6]="images/head_07.jpg";	
	pics[7]="images/head_08.jpg";			
	
	nr=Math.round(Math.random()*(anz-1)); 
	picname=pics[nr];	

	if (document.layers)
	   document.mainpic.background.src = picname;
	else if (document.all)
	   document.all.mainpic.style.backgroundImage = 'url('+picname+')';
	else if (document.getElementById)
	   document.getElementById('mainpic').style.backgroundImage = 'url('+picname+')';
}


function zoomPic(bild_name)
{
	openImgZoomWindow ("bilder.html?"+bild_name, 420,480);
}


function openImgZoomWindow (str, w,h,options)
{
	var file = '' + str;	
  var padding; 
  (navigator.appName == "Microsoft Internet Explorer") ? (padding = 10) : (padding = 0); 

  var screenw = screen.availWidth; 
  var screenh = screen.availHeight; 
  var winw = (w + 15 + padding); 
  var winh = (h + 15 + padding); 
  var posx = (screenw / 2) - (winw / 2); 
  var posy = (screenh / 2) - (winh / 2); 

  var mywin = window.open(file,"","top="+posy+",left="+posx+",width="+winw+",height="+winh+",menubar=no,locationbar=no,statusbar=no,resizable=no,toolbar=no,dependent=yes,scrollbars=yes");
   mywin.focus(); 

}


function check_form()
     {

       if(self.document.mailform.Name.value.length <= 2)
       {
         alert("Bitte teilen Sie uns Ihren Namen mit!");
         return false;
       }

       if(self.document.mailform.EMail.value.length <= 8 && self.document.mailform.Telefon.value.length <=4)
       {
         alert("Damit wir Sie erreichen koennen, nennen Sie uns bitte Ihre E-Mail-Adresse oder Ihre Telefonnummer!");
         return false;
       }

       return true;
}