function $JS( obj )
{
	if( document.getElementById )
		return document.getElementById( obj );
	else if( document.all )
		return document.all[ obj ];
	else
		return document.layers[ obj ];
}


function checkUser() {
var d = document.forms.f;

   if (d.m_naam.value==""){
                alert('U bent vergeten om uw naam in te vullen!');
                d.m_naam.focus();
                return false;
 }
   if (d.m_email.value==""){
                alert('U bent vergeten om uw email adres in te vullen!');
                d.m_email.focus();
                return false;
 }
        if (!isEmail(d.m_email.value)){
                window.alert("Uw email adres is niet correct in gevuld!");
                d.m_email.focus();
                return false;
 }

}

function isEmail(str) {
  // are regular expressions supported?
  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));
}


function loadingMessage( show )
{
	if( $JS( 'loading' ) != null )
	{
		if( show )
		{
			$JS( 'loadingText' ).innerHTML = '<img src="pics_opbouw/loading.gif" align="absmiddle" /> Bezig...';
			$JS( 'loading' ).style.display = 'block';
		}
		else
		{
			setTimeout( '$JS( \'loadingText\' ).innerHTML = \'...!\'', 500 );
			setTimeout( '$JS( \'loading\' ).style.display = \'none\'', 1000 );
		}
	}
}

function openPage(url, target, warning) {
		
	if (warning) {
		yes = confirm("Weet je 't zeker?");
	} else yes = true;
	
	if (yes) {
		if (! target) {
			document.location.href = url;
		} else {
			window.open(url);
		}
	}

}