function inactive() {
	document.getElementById("absenden").setAttribute("disabled", "disabled");	
}
function chat () {
	var breite = screen.width/2-410;
	var hoehe = screen.height/2-300;
	if (window.offenkleber && !offenchat.closed){
		offenchat.focus();
	}
	else {
		offenchat = window.open("agreement.php", "Chat", "left="+breite+",top="+hoehe+",width=820,height=600,status=no,scrollbars=no,location=no,toolbar=no,resizable=yes");
	}
}