function open_window(url) {
	window.open(url,"win",'toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=1,resizable=1,width=520,height=400');}
	
	function validate(form) {
	if (form.message.value == "" || form.subject.value == "" || form.author.value == "") {
	alert("S.V.P. alle velden correct in vullen");
	return false;
	}
	else if (!isEmail(form.Email.value)) {
	alert("S.V.P. een geldig e-mail address invullen");
	return false;
	}
	else
	{return true;}
	}
	
	function isEmail(str) {
	var supported = 0;
	  if (window.RegExp) {
		 var tempStr = "a";
		 var tempReg = new RegExp(tempStr);
		 if (tempReg.test(tempStr)) supported = 1;
	  }
	  if (!supported) 
		 return (str.indexOf(".") > 2) && (str.indexOf("@") > 0);
	  var r1 = new RegExp("(@.*@)|(\\.\\.)|(@\\.)|(^\\.)");
	  var r2 = new RegExp("^.+\\@(\\[?)[a-zA-Z0-9\\-\\.]+\\.([a-zA-Z]{2,3}|[0-9]{1,3})(\\]?)$");
	  return (!r1.test(str) && r2.test(str));
	}