function showBelMij()
{
	document.getElementById('belmij').style.display='block';
	
}

function clearText(thefield){
if (thefield.defaultValue==thefield.value)
thefield.value = ""
}

//telefoonnummer check.
var digits = "0123456789";
var phoneNumberDelimiters = "()- ";
var validWorldPhoneChars = phoneNumberDelimiters + "+";
var minDigitsInIPhoneNumber = 10;

function isInteger(s)
{   var i;
    for (i = 0; i < s.length; i++)
    {   
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    // All characters are numbers.
    return true;
}
function trim(s)
{   var i;
    var returnString = "";
     for (i = 0; i < s.length; i++)
    {   

        var c = s.charAt(i);
        if (c != " ") returnString += c;
    }
    return returnString;
}
function stripCharsInBag(s, bag)
{   var i;
    var returnString = "";
    
    for (i = 0; i < s.length; i++)
    {   
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function checkInternationalPhone(strPhone){
var bracket=3
strPhone=trim(strPhone)
if(strPhone.indexOf("+")>1) return false
if(strPhone.indexOf("-")!=-1)bracket=bracket+1
if(strPhone.indexOf("(")!=-1 && strPhone.indexOf("(")>bracket)return false
var brchr=strPhone.indexOf("(")
if(strPhone.indexOf("(")!=-1 && strPhone.charAt(brchr+2)!=")")return false
if(strPhone.indexOf("(")==-1 && strPhone.indexOf(")")!=-1)return false
s=stripCharsInBag(strPhone,validWorldPhoneChars);
return (isInteger(s) && s.length >= minDigitsInIPhoneNumber);
}

function ValidateForm(){
	var Phone=document.getElementById("nummer")
	var Name=document.getElementById("naam")
	
	if ((Name.value==null)||(Name.value=="")||(Name.value=="uw naam?")){
		alert("Vul alstublieft uw naam in!")
		Name.focus()
		return false
	}
	
	if ((Phone.value==null)||(Phone.value=="")){
		alert("Vul alstublieft uw telefoonnummer in!")
		Phone.focus()
		return false
	}
	if (checkInternationalPhone(Phone.value)==false){
		alert("U heeft uw telefoonnummer is onjuist ingevuld!")
		Phone.value=""
		Phone.focus()
		return false
	}
	return true
 }