function previewImage(galId,imgId) {
	window.open("pages/image_viewer.php?gallery="+galId+"&image="+imgId,"imageViewer","width=600, height=600");
}

function emailCheck (emailStr) {
	var email_checked;
	var checkTLD=1;
	var knownDomsPat=/^(com|net|org|edu|int|mil|gov|arpa|biz|aero|name|coop|info|pro|museum)$/;
	var emailPat=/^(.+)@(.+)$/;
	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) {
		//alert("Email address seems incorrect (check @ and .'s)");
		return false;
	}
	var user=matchArray[1];
	var domain=matchArray[2];
	for (i=0; i<user.length; i++) {
	if (user.charCodeAt(i)>127) {
		//alert("Ths username contains invalid characters.");
		return false;
	   }
	}
	for (i=0; i<domain.length; i++) {
	if (domain.charCodeAt(i)>127) {
	//alert("Ths domain name contains invalid characters.");
	return false;
	   }
	}
	if (user.match(userPat)==null) {
	//alert("The username doesn't seem to be valid.");
	return false;
	}
	var IPArray=domain.match(ipDomainPat);
	if (IPArray!=null) {
	for (var i=1;i<=4;i++) {
	if (IPArray[i]>255) {
	//alert("Destination IP address is invalid!");
	return false;
	   }
	}
	email_checked = '1';
	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) {
	//alert("The domain name does not seem to be valid.");
	return false;
	   }
	}
	if (checkTLD && domArr[domArr.length-1].length!=2 &&
	domArr[domArr.length-1].search(knownDomsPat)==-1) {
	//alert("The address must end in a well-known domain or two letter " + "country.");
	return false;
	}
	if (len<2) {
	//alert("This address is missing a hostname!");
	return false;
	}
	email_checked = '1';
	return true;
}


function validateData() {
	var valid = 1;
	if(document.getElementById('gb_naam').value!=''){
	} else {
		valid=0;
		document.getElementById('lbl_naam').style.color='#FF0000';
	}
	if(document.getElementById('gb_email').value!=''){
		if(emailCheck(document.getElementById('gb_email').value)==false) {
			valid=0;
			document.getElementById('lbl_email').style.color='#FF0000';
			alert('ongeldig e-mail adres!');
		}
	} else {
		valid=0;
		document.getElementById('lbl_email').style.color='#FF0000';
	}
	if(document.getElementById('gb_bericht').value!=''){
	} else {
		valid=0;
		document.getElementById('lbl_bericht').style.color='#FF0000';
	}
	if(valid==1){
		document.getElementById('add_message').value='true';
		document.guestbook.submit();
	} else {
		alert("Gelieve de rood gemarkeerde velden correct in te vullen a.u.b.");
	}
}