var MSG_REQ_FIELD           = 'Vergeet niet een %1 in te vullen!';
var MSG_INVALID_EMAIL       = 'Invalid email address: %1';
var MSG_TWO_FIELDS			= '%1 and %2 must be the same.';

function addbookmark()
{
	bookmarkurl = "http://test.nl/"
	bookmarktitle="Reviews over DatingWebsites"
	if (document.all) {
		window.external.AddFavorite(bookmarkurl,bookmarktitle)
	}
}

function validate_required2(field,alerttxt)
{
	with (field)
	{
		if (value==null||value=="")
		{alert(alerttxt);return false}
		else {return true}
	}
}

function trim(str) {
	str = new String(str);
	return str.replace(/^\s+/,'').replace(/\s+$/,'');
}

function validateTwoFields(field,name,field2,name2) {
	if (field.value != field2.value){
		var msg = MSG_TWO_FIELDS.replace('%1', name);
		msg = msg.replace('%2', name2);
		alert(msg);
		try{field.focus();}catch(e){}
		return false;
	}
	return true;
}

function validateEmailField(emailField, name) {
	if (isEmpty(emailField)) return true;
	if (!checkEmail(emailField.value)) {
		alert(MSG_INVALID_EMAIL.replace('%1', emailField.value));
		try{emailField.focus();}catch(e){}
		return false;
	}
	return true;
}

function validateRequiredField(field, name, dv, no_msg) {
	try
	{
		field.value = field.value.trim();
		dv = dv.trim();
	}
	catch(e) {}
	
	if (field.value.length == 0 || field.value == dv)
	{
	no_msg = no_msg || false;
		if(no_msg==true) alert(name);
		else alert(MSG_REQ_FIELD.replace('%1', name));
		try{field.focus();}catch(e){}
		return false;
	}
	return true;
}

function isEmpty(field) {
	if (field.disabled){return true;}

	if (field.type=='checkbox'||(field[0]&&field[0].type == 'checkbox')) {
		return !isCheckBoxChecked(field);
	}
	if (field.type=='radio'||(field[0]&&field[0].type == 'radio')) {
		return !isCheckBoxChecked(field);
	}
	//Try trim - will fail for input type="file".
	try
	{
		field.value = field.value.trim();
	}
	catch(e) {}
	if (field.value.length == 0) {
		return true;
	}
}

function isCheckBoxChecked(field) {
	if (field[0]) {
		for (i = 0;i<field.length;i++) {
			theField = field[i];
			if (theField.checked) {
				return true;
			}
		}
		return false;
	} else {
		if (!field.checked) {
			return false;
		}
	}
	return true;
}

function checkEmail(emailStr) {
	var emailPat=/^(.+)@(.+)$/;
	var specialChars="\\(\\)><@,;:\\\\\\\"\\.\\[\\]!%";
	var validChars="\[^\\s" + specialChars + "\]";
	var quotedUser="(\"[^\"]*\")";
	var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/;
	var atom=validChars + '+';
	var word="(" + atom + "|" + quotedUser + ")";
	var userPat=new RegExp("^" + word + "(\\." + word + ")*$");
	var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$");

	var matchArray=emailStr.match(emailPat);

	if (matchArray==null) {
		return false;
	}
	var user=matchArray[1];
	var domain=matchArray[2];
	for (i=0; i<user.length; i++) {
		if (user.charCodeAt(i)>127) {
			return false;
		}
	}
	for (i=0; i<domain.length; i++) {
		if (domain.charCodeAt(i)>127) {
			return false;
		}
	}
	if (user.match(userPat)==null) {
		return false;
	}

	var IPArray=domain.match(ipDomainPat);
	if (IPArray!=null) {
		for (var i=1;i<=4;i++) {
			if (IPArray[i]>255) {
				return false;
			}
		}
		return true;
	}

	var atomPat=new RegExp("^" + atom + "$");
	var domArr=domain.split(".");
	var len=domArr.length;
	for (i=0;i<len;i++) {
		if (domArr[i].search(atomPat)==-1) {
			return false;
		}
	}
	if (domArr[len-1].length < 2) {
		return false;
	}
	if (len<2) {
		return false;
	}

	return true;
}

function addFavorite(a) {
  title=document.title;
  url=document.location;
  try {
    // Internet Explorer
    window.external.AddFavorite(url, title);
  }
  catch (e) {
    try {
      // Mozilla
      window.sidebar.addPanel(title, url, "");
    }
    catch (e) {
      // Opera
      if (typeof(opera)=="object") {
        a.rel="sidebar";
        a.title=title;
        a.url=url;
        return true;
      }
      else {
        // Unknown
        alert('Error, please press Ctrl+D');
      }
    }
  }
  return false;
}