function swapImgRestore() { //v3.0
  var i,x,a=document.sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.p) d.p=new Array();
    var i,j=d.p.length,a=preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.p[j]=new Image; d.p[j++].src=a[i];}}
}

function findObj(n, d) { //v4.0
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=findObj(n,d.layers[i].document);
  if(!x && document.getElementById) x=document.getElementById(n); return x;
}

function swapImage() { //v3.0
  var i,j=0,x,a=swapImage.arguments; document.sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=findObj(a[i]))!=null){document.sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}



function eingabecheck()

{
	
	var error = 0;
	var ALERTTXT = "";
		
	
	if (document.kontaktform.name.value == '') {
        error = 1;
        ALERTTXT = ALERTTXT + "Bitte tragen Sie Ihren Namen ein\n";
	}  
	
	if (document.kontaktform.email.value != '') 
		{
        var Temp     = document.kontaktform.email
		var AtSym    = Temp.value.indexOf('@')
		var Period   = Temp.value.lastIndexOf('.')
		var Space    = Temp.value.indexOf(' ')
		var Length   = Temp.value.length - 1   
		
		if ((AtSym < 1) ||                     
    	(Period <= AtSym+1) ||             
    	(Period == Length ) ||             
    	(Space  != -1))                    
   		{  
      		error = 2;
      		ALERTTXT = ALERTTXT + "Bitte eine gueltige e-mail-Adresse eintragen!\n";
      		Temp.focus()
   		}

		if (document.kontaktform.text.value == '') {
        error = 1;
        ALERTTXT = ALERTTXT + "Bitte geben Sie einen Kommentar an!\n";
		}		


	if(error == 1 || error == 2) {
        alert(ALERTTXT);
        return false;
	}
	

	
	return true;
	}

}

function senden()

	{
		document.kontaktform.submit();	
		eingabecheck();
	}


function reseten()

	{
		document.kontaktform.reset();
	}

function guest() 
{
  book = window.open("http://www.albertthiele.de/guestbook/guestbook.html","popup","toolbar=no,width=740,height=580,left=100,top=100,directories=no,status=no,scrollbars=yes,resize=no,menubar=no,location=no,copyhistory=no");
}