function newsletter() {	
	var error = '';	
	if (!document.getElementById('newsletter_form_big_agb').checked) {
		error += 'Bitte akzeptieren Sie die AGB und Datenschutzbestimmungen! \n';
	}	
	if (document.getElementById('newsletter_form_big_email').value == '') {
		error += 'Bitte geben Sie Ihre E-Mailadresse an!\n';
	}	
	if (error == '') {
		document.getElementById('newsletter_form_big').submit();
	} else {
		alert(error);
	}
}


function navigation_background(id, image) {
	document.getElementById(id).style.backgroundImage = image;
}

function search_submit() {
	document.getElementById('search_small').submit();
}

function open_image(url, x, y) {
	width = screen.width;
	height = screen.height;
	xps = ((width/2)-x/2);
	yps = ((height/2)-y/2);
	window.open (url, "Bildergalerie"); 

}

function delete_searchstring() {
	if (document.getElementById('search_string_text').value == 'SUCHE')
		document.getElementById('search_string_text').value = '';
}


function send_mail (url) {

	var xps = ((screen.width/2)-400/2);
	var yps = ((screen.height/2)-200/2);
		
	var intro = "width=" + 400 + 
			",height=" + 200 +
			",directories=" + "no" +
			",toolbar=" + "no" +
			",location=" + "no" +
			",menubar=" + "no" +
			",scrollbars=" + "yes" +
			",status=" + "no" + 
			",resizable=" + "yes" +
			",dependent=" + "no" +
			",fullscreen=" + "no";
	var win = window.open (url, "E-Mail", intro); 
	
	win.moveTo(xps, yps);
	win.focus();
	
}