function check_form(ary_fields){
	for (var name in ary_fields){
		if(ary_fields[name] == "typ_email"){
			if(document.getElementById(name).value == "" 
			|| document.getElementById(name).value.indexOf ('@') < 1 
			|| document.getElementById(name).value.indexOf ('.') < 1 
			|| document.getElementById(name).value.indexOf ('@') == document.getElementById(name).value.length-1 
			){ 
				alert("Bitte geben Sie eine gltige E-Mail Adresse ein.");
				document.getElementById(name).focus(); 
				return false;
			}
		}
		if(ary_fields[name] == "typ_text"){
			if(document.getElementById(name).value == "" || document.getElementById(name).value == "text"){ 
				alert("Bitte geben eine Nachricht ein.");
				document.getElementById(name).focus(); 
				return false;
			}
		}
		if(ary_fields[name] == "typ_nummer_mobil"){
			if(document.getElementById(name).value == "" || document.getElementById(name).value == "mobilnummer"){ 
				alert("Bitte geben Sie Ihre Mobilnummer ein z.B. 0041787654551.");
				document.getElementById(name).focus(); 
				return false;
			}
		}
		if(ary_fields[name] == "typ_text_sms"){
			if(document.getElementById(name).value == "" || document.getElementById(name).value == "text"){ 
				alert("Bitte geben eine Nachricht ein.");
				document.getElementById(name).focus(); 
				return false;
			}
			if(document.getElementById(name).value.length > 160){ 
				alert("Ihre Nachricht ist zu lang!");
				document.getElementById(name).focus(); 
				return false;
			}
			if(document.getElementById(name).value.length < 11){ 
				alert("Ihre Nachricht ist zu kurz!");
				document.getElementById(name).focus(); 
				return false;
			}
		}
		if(ary_fields[name] == "typ_code"){
			if(document.getElementById(name).value == "" || document.getElementById(name).value == "code" || document.getElementById(name).value == "Code"){ 
				alert("Bitte bertragen Sie den Code.");
				document.getElementById(name).focus(); 
				return false;
			}
		}
	}
	return true;
}