function changeImages() {
	if (document.images ) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

function ValidEmail(s) 
{ 
				var Count; 
				var s2; 
				// empty or blank email 
				if (EmptyString(s) == false) {
					// email without @ 
					if (s.indexOf('@') == -1) return (false); 
					// email with @ as the 1st char 
					if (s.indexOf('@') == 0) return (false); 
					// email with @ as the last char 
					if ((s.indexOf('@')+1) == s.length) return (false); 
					// email without . 
					if (s.indexOf('.') == -1) return (false); 
					// email with . as the 1st char 
					if (s.indexOf('.') == 0) return (false); 
					// email with . as the last char 
					if ((s.indexOf('.')+1) == s.length) return (false); 
					// Now look for the first . after the first @ 
					// s2 = string after the first @ 
					s2=s.substring(s.indexOf('@')+1,s.length); 
					// email without a dot after the first @ 
					if (s2.indexOf('.') == -1) return (false); 
					// email dot right after the first @ 
					if (s2.indexOf('.') == 0) return (false); 
				}
				return (true); 
} // end ValidEmail


function EmptyString(s) 
{ 
				var Count; 
				var Nblank = 0; 
				if (s.length == 0) return (true); // empty string 
				// count the number of blank chars 
				for (Count = 0; Count < s.length; Count++) { 
				if (s.charAt(Count) == " ") Nblank++; 
				} 
				if (Nblank == s.length) 
				return (true); 
				else 
				return (false); 
} // end EmptyString


			function reset() 
			{
				window.document.forms["guestbook"].reset();
			}
			
			
			function submitForm() 
			{			
				if (ValidEmail(window.document.forms["guestbook"].email.value)) 
				{
					if (window.document.forms["guestbook"].option9.checked == false && window.document.forms["guestbook"].option10.checked == false && window.document.forms["guestbook"]) 
					{
						alert('Keine Broschuren ausgewahlt');
					} 
					else 
					{
						if (window.document.forms["guestbook"].brochure[0].checked != true && window.document.forms["guestbook"].brochure[1].checked != true) 
						{
							alert('Wahlen Sie Ja oder Nein');
						} 
						else 
						{
							//window.document.forms["newsletter"].action.value = "submit";
							window.document.forms["guestbook"].submit();
						}
					}
				} else
				{
					alert('Ungültige E-Mail Adresse');
				}
			}
			
function validateNewsletterForm(Newsletter) 
{
	if (Newsletter.email.value != Newsletter.email2.value)
	{
			alert("Die beiden E-Mail-Adressen sind unterschiedlich. Bitte versuchen Sie es erneut.");			
			return (false);
	}
	
	var valOK = true;
	var incomplete = '';
	
	if ( document.newsletter.email.value != "") 
	{
	// if email in, is it valid?
		if (!ValidEmail(document.newsletter.email.value)) 
			{	
				alert("Ungültige E-Mail Adresse"); 
				valOK = false;
			}
	}
	else
	{
			alert('Leere E-mail Addresse');
			valOK = false;
	}
	
	if (valOK)
		{ 
		return true;
		}
	else
		{
		return false;
		}
}

function submitNewsletterForm()
{
	if (validateNewsletterForm(document.newsletter)) 
	{
		document.newsletter.submit()
	}
}