function check_form(arr_velden)
{

	var error = false;

	for(var x= 0;x<arr_velden.length;x++)
	{
		if(document.getElementById(arr_velden[x]).value=='')
		{
			error = true;
			document.getElementById(arr_verplicht[x]).style.background="#EF0000";
		}
		else
		{
			document.getElementById(arr_verplicht[x]).style.background="#FFFFFF";
		}


	}
/*
	if(emailCheck(document.getElementById("txt_email").value)!=true)
	{
		error = true;
	}
*/
	if(error==true)
	{
		alert("Vul alle gegevens juist in aub!");
	}
	else
	{
		document.getElementById("frm_form").submit();
	}

}

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 check_guestbook()
{
	var error = false;
	var arr_velden = Array("txt_naam","txt_bericht");
	for(var x= 0;x<arr_velden.length;x++)
	{
		if(document.getElementById(arr_velden[x]).value=='')
		{
			error = true;
			document.getElementById(arr_velden[x]).style.background = "#960000";
		}
		else
		{
			document.getElementById(arr_velden[x]).style.background = "#FFFFFF";
		}
	}

	if(error==true)
	{
		alert("Vul alle gegevens juist in aub!");
	}
	else
	{
		document.getElementById("frm_guestbook").submit();
	}

}
function check_contact()
{
	var error = false;
	var arr_velden = Array("txt_naam","txt_bericht");
	for(var x= 0;x<arr_velden.length;x++)
	{
		if(document.getElementById(arr_velden[x]).value=='')
		{
			error = true;
			document.getElementById(arr_velden[x]).style.background = "#960000";
		}
		else
		{
			document.getElementById(arr_velden[x]).style.background = "#FFFFFF";
		}
	}

	if(emailCheck(document.getElementById("txt_email").value)!=true)
	{
		error = true;
		document.getElementById("txt_email").style.background = "#960000";
	}
	else
	{
		document.getElementById("txt_email").style.background = "#FFFFFF";
	}

	if(error==true)
	{
		alert("Vul alle gegevens juist in aub!");
	}
	else
	{
		document.getElementById("frm_contact").submit();
	}

}