function getObject(obj) {
  var theObj;
  if(document.all) {
    if(typeof obj=="string") {
      return document.all(obj);
    } else {
      return obj.style;
    }
  }
  if(document.getElementById) {
    if(typeof obj=="string") {
      return document.getElementById(obj);
    } else {
      return obj.style;
    }
  }
  return null;
}

function toCount(entrance,exit,text,characters) {
  var entranceObj=getObject(entrance);
  var exitObj=getObject(exit);
  var length=characters - entranceObj.value.length;
  if(length <= 0) {
    length=0;
    text='<span class="disable"> '+text+' </span>';
    entranceObj.value=entranceObj.value.substr(0,characters);
  }
  exitObj.innerHTML = text.replace("{CHAR}",length);
}

function getCheckedValue(radioObj) {
	if(!radioObj)
		return "";
	var radioLength = radioObj.length;
	if(radioLength == undefined)
		if(radioObj.checked)
			return radioObj.value;
		else
			return "";
	for(var i = 0; i < radioLength; i++) {
		if(radioObj[i].checked) {
			return radioObj[i].value;
		}
	}
	return "";
}

function validate(){
	var t=document.form; 
	error = false;
	var tip=getCheckedValue(t.R1)	;
	
	if (tip=="V1")
	{  if (t.email.value==""){
	error = true;
	 window.alert("Graag uw e-mailadres opgeven!");
	 	 }}
	 else
	 if (t.phone.value=="")
	 { window.alert("Graag uw telefoonnummer opgeven!");
	error = true;
	 }	 
//window.alert(error);
	 if( !error ) t.submit();
}