// JavaScript Document

function checkForm(){
	
		if(document.mailer.nachname.value=="")	{ 
		alert ("Please enter your last name!");
		document.mailer.nachname.focus();
		return false;
	}
	
	if( document.mailer.nachname.value.length <2  )	{
		alert ("Your last name should contain more than one letter!");
		document.mailer.nachname.focus();
		return false;
	}
	
	if(!isNaN (document.mailer.nachname.value))	{ 
		alert ("Please enter letters only at your last name!");
		document.mailer.nachname.focus();
		return false;
	}
	
	if(document.mailer.strasse.value=="")	{
		alert ("Please enter your street or a postbox!");
		document.mailer.strasse.focus();
		return false;
	}
	
	if( document.mailer.strasse.value.length <2  )	{
		alert ("Your street or postbox should contain more than one letter!");
		document.mailer.strasse.focus();
		return false;
	}
	
		if(document.mailer.plz.value=="") {
		alert ("Please enter your postal code!");
		document.mailer.plz.focus();
		return false;
	}

	if(document.mailer.ort.value=="") {
		alert ("Please enter your city!");
		document.mailer.ort.focus();
		return false;
	}
	
	if( document.mailer.ort.value.length <2  )	{
		alert ("Your city should contain more than one letter!");
		document.mailer.ort.focus();
		return false;
	}

		if(document.mailer.telefon.value=="")	{
		alert ("Please enter your phone number!");
		document.mailer.telefon.focus();
		return false;
	}
	
	if( document.mailer.telefon.value.length <4  )	{
		alert ("Your phone number should contain more than three characters!");
		document.mailer.telefon.focus();
		return false;
	}
	
	alert('Thank you very much for your request.\Your mail will be delivered now.'); 
	return true;
}