function popup(url,name,width,height,props){

	var props = props+',directories=no,status=no,menubar=no,copyhistory=yes,width='+width+',height='+height;
	var popup = window.open(url,'popup',props);
}


function isEmail(email) {
	//var rx = /^..+@..+\..{2,5}$/;
	var rx =/^[_a-zA-Z0-9-]+(\.[_a-zA-Z0-9-]+)*@[a-zA-Z0-9-]+(\.[a-zA-Z0-9-]+)*\.([a-zA-Z]{2,4})$/;
	return rx.test(email);
}


function checkform_contact(){
	if(document.contactform.first_name.value == "") {
		alert("Please insert your first name.");
		document.contactform.first_name.focus();
		return false ;
	}
	if(document.contactform.last_name.value == "") {
		alert("Please insert your last name.");
		document.contactform.last_name.focus();
		return false ;
	}
	if(isEmail(document.contactform.email.value)==false){
		alert("Please insert a valid email addresse.");
		document.contactform.email.focus();
		return false;
	}
	if(document.contactform.profession.value == "") {
		alert("Please insert a profession.");
		document.contactform.profession.focus();
		return false ;
	}
		if(document.contactform.organisation.value == "") {
		alert("Please insert a organisation.");
		document.contactform.organisation.focus();
		return false ;
	}
	if(document.contactform.adress1.value == "") {
		alert("Please insert a adress.");
		document.contactform.adress1.focus();
		return false ;
	}
	if(document.contactform.city.value == "") {
		alert("Please insert a city.");
		document.contactform.city.focus();
		return false ;
	}
	if(document.contactform.city.value == "") {
		alert("Please insert a city.");
		document.contactform.city.focus();
		return false ;
	}
	if(document.contactform.zip.value == "") {
		alert("Please insert a postal code.");
		document.contactform.zip.focus();
		return false ;
	}
	if(document.contactform.email.value == "") {
		alert("Please insert a e-mail.");
		document.contactform.e-mail.focus();
		return false ;
	}

	return true ;
}


function check_regform(){
	if(document.regform.benutzername.value == "") {
		alert("Bitte geben Sie einen Benutzernamen ein.");
		document.regform.benutzername.focus();
		return false ;
	}
	if(document.regform.passwort.value == "") {
		alert("Bitte geben Sie ein Passwort ein.");
		document.regform.passwort.focus();
		return false ;
	}
	if(isEmail(document.regform.email.value)==false){
		alert("Bitte geben Sie eine gültige E-Mail Adresse ein.");
		document.regform.email.focus();
		return false;
	}
	if(document.regform.mailtext.value == "") {
		alert("Bitte geben Sie einen Bestätigungstext ein.");
		document.regform.mailtext.focus();
		return false ;
	}
	
	
	
}