function popUp(URL,width,height) {
	day = new Date();
	id = day.getTime();

	var winLeft = (screen.width - width) / 2;
	var winUp = (screen.height - height) / 2;

	eval("page" + id + " = window.open(URL, '" + id + "', 'toolbar=0,scrollbars=0,location=0,statusbar=0,menubar=0,resizable=0,width='+width+',height='+height+',left='+winLeft+',top='+winUp);");
}


function contact_by_mail(user, domain, suffix, content) 
{
	if (!content)
	{
		document.write('<a href="' + 'mailto:' + user + '@' + domain + '.' + suffix + '">' + user + '@' + domain + '.' + suffix + '</a>');
	} else
	{
		document.write('<a href="' + 'mailto:' + user + '@' + domain + '.' + suffix + '">' + content + '</a>');
	}
	return true;
}

function check_length(my_form){
	var maxLen = 50; // max number of characters allowed
	alert(my_form.overig.value.length);
	if (my_form.overig.value.length >= maxLen) {
		// Alert message if maximum limit is reached.
		// If required Alert can be removed.
		// Reached the Maximum length so trim the textarea
		my_form.overig.value = my_form.overig.value.substring(0, (maxLen -1));
		return false;
	}
	else{ // Maximum length not reached so update the value of my_text counter
		document.getElementById('char').value = '('+(maxLen - my_form.overig.value.length -1)+')';
		document.getElementById('radio_9').checked = true;
		return true;
	}
}

function waarde(data, my_form, content){
	var maxLen = 50; // max number of characters allowed	
	if(data.length >= 51){
		my_form.overig.value = my_form.overig.value.substring(0, (maxLen));
		document.getElementById('char').value = '('+(maxLen - my_form.overig.value.length)+')';
		var msg = content;
		alert(msg);
	}else{
		document.getElementById('char').value = '('+(maxLen - my_form.overig.value.length)+')';
		document.getElementById('radio_9').checked = true;		
	}
}

function un_check(error){
	var objForm = document.getElementById('enquete_formulier');
	var count = 0;
	for (var i=0; i < (objForm["vraag1[]"].length); i++)
	{
		if (objForm["vraag1[]"][i].checked)
		{
			if(count == 2){
				alert(error);	
				objForm["vraag1[]"][i].checked = false;
				if(objForm["vraag1[]"][i].value == 9){
					document.getElementById('overige').value = '';
					document.getElementById('char').value = '(50)';
				}
			
			}else{
				count++;
			}
		}
	}
}



function validate_form(this_form, content)
{
	var objForm = document.getElementById('enquete_formulier');
	var count = 0;
	var error_vraag1 = true;
	for (var i=0; i < (objForm["vraag1[]"].length); i++)
	{
		if (objForm["vraag1[]"][i].checked)
		{
			error_vraag1 = false;
		}
	}

	var allElements = this_form.vraag2;
	
	if ( ( allElements[0].checked == false ) && ( allElements[1].checked == false ) || (error_vraag1 == true)){
		alert(content);
		this_form.vraag2[0].focus();
		return false;	
	}else{
		return true;
	}

}