function checkdata () {
	var checked = "true";
	var check_email = /^([_a-zA-Z0-9-]+)(\.[_a-zA-Z0-9-]+)*@[a-zA-Z0-9-\.]+(\.[a-zA-Z]{2,3}){1,2}$/;
	var apname  = document.forms[0].apname.value;	
	var firma   = document.forms[0].firma.value;			
	var str     = document.forms[0].strasse.value;	
	var plz     = document.forms[0].plz.value;	
	var ort     = document.forms[0].ort.value;	
	var land     = document.forms[0].land.value;
	var email   = document.forms[0].email.value;		
	if (!email || ((check_email.test(email)) == false)) {
		getById('femail').style.color = 'red';
		checked = 'email';
	}
	if (!str) {
		getById('fstrasse').style.color = 'red';
		checked = 'strasse';
	}
	if (!ort) {
		getById('fort').style.color = 'red';
		checked = 'strasse';
	}
	if (!plz) {
		getById('fort').style.color = 'red';
		checked = 'strasse';
	}
	if (!firma) {
		getById('ffirma').style.color = 'red';
		checked = 'firma';
	}
	if (!apname) {
		getById('fname').style.color = 'red';
		checked = 'name';
	} 
	if (!land) {
		getById('fland').style.color = 'red';
		checked = 'tel';
	} 

	if (checked == "true") {
		document.forms[0].submit();	
	} else {
		getById('angeben').style.color = 'red';
		getById('angeben').style.textDecoration = 'underline';
	}
	/*/ Zwischenspeichern der Daten in opener
	opener.apname = apname;
	opener.firma = firma;
	opener.abteilung = abteilung;		
	opener.str = str;
	opener.plz = plz;
	opener.ort = ort;
	opener.land = land;
	opener.tel = tel;
	opener.fax = fax;
	opener.email = email;
	opener.produkt = produkt;
	opener.keepdata();
	// Ende Zwischenspeichern*/
}	

// Ein Layer beschreiben
function writeInto(obj, text, win) {
	if(!obj) return;
	if(typeof obj == "string") obj = getById(obj, win);
	
	if(typeof obj.innerHTML != 'undefined') {
  		obj.innerHTML = text;
	} else if(typeof document.layers != 'undefined') {
		obj.document.open('text/html');
    	obj.document.write(text);
     	obj.document.close();
	}
}
	
// getById(id [, win])
function getById(id, win) {
	var doc = window.document;
   	if(win) doc = win.document;

   	if(typeof id == 'undefined') return null;
	
	var obj = null;
	if(document.getElementById) obj = doc.getElementById(id);
	else if(typeof document.layers != 'undefined')  obj = _findObj_(id, doc);
	else if(document.all) obj = doc.all[id];

	return obj;
}