function preloader(){
	document.getElementById('div_ladebalken').style.display = 'none';
	document.getElementById('div_inhalt').style.display = '';
	document.getElementById('body_main').className = 'body';
}

function navigation(id, typ){
	if(typ=='button'){
		document.getElementById(id).className = (document.getElementById(id).className=='button') ? 'buttonHover' : 'button';
	}
}

function getLink(seite){
	document.location.href = seite;
}

function checkEmail(email){
	var res = false;
	
	var filter = /^(\w+(?:\.\w+)*)@((?:\w+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i;
	
	if(filter.test(email)){
		res = true;
	}
	
	return res;
}