// JavaScript Document
var cfNR = 2; 
function addFriend(){
	document.getElementById('poster_inv'+cfNR).style.display = 'block';
	if(cfNR < 5)
		cfNR++;
}

function trim(s)
{
  return s.replace(/^\s+|\s+$/, '');
} 

function validateEmail(fld) {
    var error="";
    var tfld = trim(fld.value);                        // value of field with whitespace trimmed off
    var emailFilter = /^[^@]+@[^@.]+\.[^@]*\w\w$/ ;
    var illegalChars= /[\(\)\<\>\,\;\:\\\"\[\]]/ ;
    
    if (fld.value == "") {
        fld.style.background = 'Yellow';
        error = "You didn't enter an email address.\n";
    } else if (!emailFilter.test(tfld)) {              //test email for illegal characters
        fld.style.background = 'Yellow';
        error = "Please enter a valid email address.\n";
    } else if (fld.value.match(illegalChars)) {
        fld.style.background = 'Yellow';
        error = "The email address contains illegal characters.\n";
    } else {
        fld.style.background = 'White';
    }
    return error;
}

function testCommentForm()
{
	
	var error="";
	
	if(document.getElementById('author').value == "")
	{
		error += "No name ";
		document.getElementById('author_message').style.display = 'block';
	}
	else
	{
		document.getElementById('author_message').style.display = 'none';
	}
	if(document.forms.commentform.email.value == "")
	{
		error += "No email ";
		document.getElementById('email_message').style.display = 'block';
	}
	else
	{
		document.getElementById('email_message').style.display = 'none';	
	}
	if(document.forms.commentform.comment.value == "")
	{
		error += "No comment ";
		document.getElementById('comment_message').style.display = 'block';
	}
	else
	{
		document.getElementById('comment_message').style.display = 'none';
	}
	
	if(error == "")
		return true;
	else
		return false;
}
function testNrCharacters(questionTitle)
{
	if(questionTitle.length < 60)
		document.getElementById('max_char').style.display = "none";
	else
		document.getElementById('max_char').style.display = "block";
}
function testNrCharactersPOST(questionTitle)
{
	if(questionTitle.length < 60)
		document.getElementById('max_char_post').style.display = "none";
	else
		document.getElementById('max_char_post').style.display = "block";
}