function check_form(){
	var name=document.getElementById('fName');
	var email=document.getElementById('fMail');
	var text=document.getElementById('fText');
	var captcha=document.getElementById('Captcha');
	if (name.value.length<4){
		alert('Bitte geben Sie einen Namen ein.');
		name.focus();
		return false;
	}
	if (email.value.search(/^([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$/) == -1){
		alert('Bitte geben Sie eine gueltige EMail-Adresse ein.');
		email.focus();
		return false;
	}
	if (text.value.length<10){
		alert('Bitte geben Sie eine Nachricht ein.');
		text.focus();
		return false;
	}
	if (captcha.value.length<1){
		alert('Bitte geben Sie das Ergebnis fuer die Rechenaufgabe ein.');
		captcha.focus();
		return false;
	}
	return true;
}

function swapImage(element,image){
	element.style.backgroundImage='url('+image+')';
}
function swapSubmenu(element,display){
	element.style.display=display;
}
function damx(a,b){
	if (a==true){
		menu = document.getElementById('damx-menu-'+b);
		menu.style.display='block';
	} else {
		document.getElementById('damx-menu-bausubstanz').style.display='none';
		document.getElementById('damx-menu-eaw-lingen').style.display='none';
	}
}

function browseMenu(pointer,image){
	damx(false);
	if (pointer != 'none'){
		swapImage(document.getElementById('unikatmodelle'),'images/menu.unikatmodelle.gif');
		swapSubmenu(document.getElementById('sub-unikatmodelle'),'none');
		swapImage(document.getElementById('modellbausaetze'),'images/menu.modellbausaetze.gif');
		swapSubmenu(document.getElementById('sub-modellbausaetze'),'none');
		swapImage(document.getElementById('publikationen'),'images/menu.publikationen.gif');
		swapSubmenu(document.getElementById('sub-publikationen'),'none');
		swapImage(document.getElementById('dokumentationen'),'images/menu.dokumentationen.gif');
		swapSubmenu(document.getElementById('sub-dokumentationen'),'none');
		swapImage(document.getElementById('shop'),'images/menu.shop.gif');
		swapSubmenu(document.getElementById('sub-shop'),'none');
		swapImage(document.getElementById('kontakt'),'images/menu.kontakt.gif');
		swapSubmenu(document.getElementById('sub-kontakt'),'none');
		swapSubmenu(document.getElementById('sub-'+pointer),'inline');
		swapImage(document.getElementById(pointer),image);
		if (document.getElementById('layout-thirdmenu')){
			document.getElementById('layout-thirdmenu').style.display='none';
		}
	}
}

function damx_hover(a,b){
	if (a == 'on'){
		b.style.backgroundColor='#eaeaea';
	} else {
		b.style.backgroundColor='#ffffff';
	}
}

function Zoom(img,size,text){
	var zoom_window=window.open("img_zoom.php?file="+img+"&amp;desc="+text, "Zoom", size+",location=no,left=100,top=200,scrollbars=no,status=no");
}