function set_tag(){
	antag = document.form.an_tag.value;
	anmonat = document.form.an_monat.value;
	abtag = antag;
	abtag++;
	if(antag < 31){
		document.form.ab_tag.value = abtag;
	}
	else{
		anmonat++;
		document.form.ab_tag.value = 1;
		document.form.ab_monat.value = anmonat;
	}
}
function set_monat(){
	anmonat = document.form.an_monat.value;
	document.form.ab_monat.value = anmonat;
}
function set_date(){
	antag = '<?= $tag; ?>';
	anmonat = '<?= $monat; ?>';
	document.form.an_tag.value = antag;
	document.form.an_monat.value = anmonat;
	abtag = antag;
	abmonat = anmonat;
	abtag++;
	abmonat++;
	if(antag < 31){
		document.form.ab_tag.value = abtag;
		document.form.ab_monat.value = anmonat;
	}
	else{
		anmonat++;
		document.form.ab_tag.value = 1;
		document.form.ab_monat.value = abmonat;
	}
}
function popup(url, breite, hoehe) {
	links = (screen.width/2)-(breite/2);
	oben = (screen.height/2)-(hoehe/2);
	popup = window.open(url,"popup","height="+hoehe+",width="+breite+",status = no,toolbar = no,menubar = no,location = no,resizable = no,titlebar = no,scrollbars = "+scroll+",fullscreen = no,top ="+oben+",left ="+links);
	popup.focus();
}