// JavaScript Document

function checkfield(obj){
	var amt = numberBedrag(obj.value);
	if (isNaN(amt)){
		alert('U dient een geldig bedrag in te vullen');
		return false;
	}else{
		obj.value = stringBedrag(amt);
		return true;
	}
}
	
	
function stringBedrag(a){
	var s = '';
	amount = a.toString();
	if(amount.indexOf('.') >= 0){
		var e = amount.substring(0,amount.indexOf('.'));
		var c = amount.substring(amount.indexOf('.')+1,amount.length);
		if(c.length==1){
			c = c+"0"
			}else if(c.length>2){
			c = c.substring(0,2)	
			}			
		var s = e+','+c;
	}else{
		var s = amount+',00';
		}
	return s;
}

function numberBedrag(a){
	if(a.indexOf(',') >= 0){
		var e = a.substring(0,a.indexOf(','));
		var c = a.substring(a.indexOf(',')+1,a.length);
		if(c=='-'){
			c=0;
			}
		var amount = Number(e+'.'+c);
	} else{
		var amount = Number(a);
	}
	return amount;
}