function wechsel(arr,n)
{
	//if(n < arr.length - 1) {
	var a = n;
	var b = n +1;
	if( b == arr.length){
		b = 0;
	}
	if(document.getElementById(arr[a]) != undefined){
	//alert(arr[n]);
	//	document.getElementById(arr[a]).style.display = 'none';
	//	document.getElementById(arr[b]).style.display = 'block';
		//	slideOut(arr[b],arr[a],0,250,1);
		//	slideOutVertical(arr[b],arr[a],0,950,2);
			fadeIn(arr[b],arr[a],0,1,0.01);
		}
	setTimeout(function() {wechsel(arr, b);},10000);
//	}
}
function fadeIn(elmIn,elmOut,hIn,hOut,steps)
{ 
	if(elmOut!=elmIn){
		var newhOut = hOut - steps;
		var newhIn = hIn + steps;
		document.getElementById(elmOut).style.opacity=newhOut;
		document.getElementById(elmIn).style.opacity=newhIn;
		if(newhOut>0){
			setTimeout("fadeIn('" + elmIn + "','" + elmOut + "'," + newhIn +"," + newhOut +"," + steps +")",'20');
		}

	}
}
function slideOutVertical(elmIn,elmOut,hIn,hOut,steps)
{ 
	if(elmOut!=elmIn){
		var newhOut = hOut - steps;
		var newhIn = hIn + steps;
		document.getElementById(elmOut).style.width=newhOut +"px";
		document.getElementById(elmIn).style.width=newhIn +"px";
		if(newhOut>0){
			setTimeout("slideOutVertical('" + elmIn + "','" + elmOut + "'," + newhIn +"," + newhOut +"," + steps +")",'0');
		}

	}
}
function slideOut(elmIn,elmOut,hIn,hOut,steps)
{ 
	if(elmOut!=elmIn){
		var newhOut = hOut - steps;
		var newhIn = hIn + steps;
		document.getElementById(elmOut).style.height=newhOut +"px";
		document.getElementById(elmIn).style.height=newhIn +"px";
		if(newhOut>0){
			setTimeout("slideOut('" + elmIn + "','" + elmOut + "'," + newhIn +"," + newhOut +"," + steps +")",'0');
		}

	}
}
function lichtbox(width,height,image)
{
var width=width ;
var height=height;
var h=(height + 40) / 2;
var w = (width +40) / 2;
var close='<a style="background-color:#800;display:block;text-align:right;padding-right:10px;height:15px" href="close" onclick="document.getElementById(\'bildbox\').style.display=\'none\';document.getElementById(\'lichtbox\').style.display=\'none\';return false;">X</a>';
//alert('show bild');
document.getElementById('lichtbox').style.margin='-' + h +'px 0 0 -' + w +'px';
//document.getElementById('lichtbox').style.margin-top='-' + (height+40) +'px';
document.getElementById('lichtbox').style.width='' + (width+80) +'px';
document.getElementById('lichtbox').style.height='' + (height+80) +'px';
document.getElementById('lichtbox').innerHTML='' + close + '<img style="margin: 20px 40px 40px 40px" src="content/' + image + '">';
document.getElementById('bildbox').style.display='block';
document.getElementById('lichtbox').style.display='block';
}
function istEmail(elm) 
		{
			 if (elm.value.indexOf("@") != "-1" &&
				 elm.value.indexOf(".") != "-1") {
				 return false;
			 }
			 else {
				 return true;
			 }
		}

function is_ziffer(chStr)
{
	var ok=true;
	for(i=0;i<chStr.length;++i) {
		if( chStr.charAt(i) < "0" || chStr.charAt(i) > "9"){
			ok = false;}
		}
	return ok;
}

function checkForm(FormName)  
{ 
	for(i=0; i<document.forms[FormName].elements.length; i++)
		{

			if(document.forms[FormName].elements[i].name.substr(5,3)=='_p_')
			{
		
				if(document.forms[FormName].elements[i].value == "")
					{
						
						var feldname = document.forms[FormName].elements[i].name.substr(8,document.forms[FormName].elements[i].name.length - 9)
		 				alert(feldname + " is mandatory !\nPlease check your entry!");
	 					document.forms[FormName].elements[i].focus();
	 					return false;
					}
			}
			if(document.forms[FormName].elements[i].name.substr(5,3)=='_e_')
			{
		
				if(istEmail(document.forms[FormName].elements[i]))
					{
						alert("Please submit a valid E-Mail!");
	 					document.forms[FormName].elements[i].focus();
	 					return false;
					}
			}
}
return true;
}