function dpsender(empf)
{
var empfaenger = empf.replace('dpeddp','@');
window.location.href='mailto:' + empfaenger;
return false;
}

function nextBild(bildakt)
{

var akt=parseInt(document.getElementById("aktnr").value);
if(akt==last)
{var next=0;}else{var next=akt+1;}
document.getElementById("aktnr").value=next;
document.getElementById("aktbild").innerHTML=bilder[next];
document.getElementById("aktbildtext").innerHTML=bildunterschriften[next];
return true;
}
function prevBild(bildakt)
{

var akt=parseInt(document.getElementById("aktnr").value);
if(akt==0)
{var next=last;}else{var next=akt-1;}
document.getElementById("aktnr").value=next;
document.getElementById("aktbild").innerHTML=bilder[next];
document.getElementById("aktbildtext").innerHTML=bildunterschriften[next];
return true;
}

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 fill in your valid email-address");
	 					document.forms[FormName].elements[i].focus();
	 					return false;
					}
			}
}
return true;
}