///////////////////////////////////////////////////////////////////////////////////
//  Einstellungen - Funktionen
///////////////////////////////////////////////////////////////////////////////////

function checkEinstellungen()
{
	// for filtering + and -
	var numbertext1 = String(document.USER_Einstellungen.gc_telefon_c01.value);
	var numbertext2 = String(document.USER_Einstellungen.gc_telefon_c02.value);
	var numbertext3 = String(document.USER_Einstellungen.gc_telefon_c03.value);
	var numbertext4 = String(document.USER_Einstellungen.gc_telefon_c04.value);
	
	if(	   (numbertext1.charAt(0) == "-") || (numbertext1.charAt(0) == "+")
		|| (numbertext2.charAt(0) == "-") || (numbertext2.charAt(0) == "+")
		|| (numbertext3.charAt(0) == "-") || (numbertext3.charAt(0) == "+")
		|| (numbertext4.charAt(0) == "-") || (numbertext4.charAt(0) == "+") )
	{
		alert("Alle eingetragenen Telefonnummern dürfen nur Zahlen enthalten.");
		return false;
	}
			
	// for filtering all other chars
	if((isNaN(document.USER_Einstellungen.gc_telefon_c01.value) == true)
		|| (isNaN(document.USER_Einstellungen.gc_telefon_c02.value) == true) 
		|| (isNaN(document.USER_Einstellungen.gc_telefon_c03.value) == true) 
		|| (isNaN(document.USER_Einstellungen.gc_telefon_c04.value) == true) )
	{
		alert("Die eingetragene Telefonnummer darf nur Zahlen enthalten.");
		return false;
	}
	
	return true;
}