// JavaScript Document

	function f_only_numbers(el){
		el.value = el.value.replace(/[\D]/gi,'');
	}
	
	function f_only_letters(el){
		el.value = el.value.replace(/[^a-zA-Z\.\s]/gi,'').replace(/\s{2}/gi,' ');
	}
	
	function f_only_letters_and_numbers(el){
		el.value = el.value.replace(/[^a-zA-Z\.\s\d]/gi,'');
	}
	
	function f_initials(el){		
		el.value = el.value.replace(/[^a-zA-Z]/gi,'').replace(/\./gi,'');		
		
		if (el.value.length > 0){
			var retval = "";
			for (i=0; i < el.value.length; i++){
				retval += el.value.substr(i,1)+".";
			}
			el.value = retval.toUpperCase();
		}		
	}
	
	function f_zipcode(el){
		/*
		Acties : 
		1. Naar hoofdletters
		2. Alle onjuiste karakters verwijderen
		*/
		el.value = el.value.toUpperCase().replace(/[^a-zA-Z\d]/gi,'');		
	}