var REGEX_EMAIL         = /^[a-z0-9_+.-]+@[a-z0-9_+.-]+\.[a-z0-9_+.-]*[a-z]{2,5}$/;
    var REGEX_SCREEN_NAME   = /^[a-z0-9_]{4,12}$/i;
    var REGEX_DATE          = /^([0-9]{2})\-([0-9]{2})\-([0-9]{4})$/;
    var REGEX_MOBILE        = /^04[0-9]{8}$/;
    var REGEX_PASSWORD      = /^.{4,}$/;

function validDate(d) {
    var dArr = d.match(REGEX_DATE);
    if( dArr && 
        dArr[1] >= 1 && dArr[1] <= 31 &&
        dArr[2] >= 1 && dArr[2] <= 12 &&
        dArr[3] >= 1900) 
    {
        if (dArr[1] == 31 && (dArr[2] == 4 || dArr[2] == 6 || dArr[2] == 9 || dArr[2] == 11)) {
            return false;
        } 
        else if (dArr[1] >= 30 && dArr[2] == 2) {
            return false;
        }
        else if (dArr[2] == 2 && dArr[1] == 29 && !(dArr[3] % 4 == 0 && (dArr[3] % 100 != 0 || dArr[3] % 400 == 0))) {
            return false;
        } 
        else {
            return true;
        }
    } else {
        return false;
    }
}

function validMobile(m) {
    return m.match(REGEX_MOBILE);
}

function validScreenName(s) {
    return s.match(REGEX_SCREEN_NAME);
}

function validEmail(e) {
    return e.match(REGEX_EMAIL);
}

function validPassword(p) {
    return p.match(REGEX_PASSWORD);
}

function validSeasonName(n) {
    return n.match(REGEX_SEASON_NAME);
}

function ucwords(words) {
    return words.replace(/^(.)|\s(.)/g, function($1) { 
        return $1.toUpperCase(); 
    });
}

function registerFormError(fieldID, error) {
    try {
        if(error) {
            if(!$(fieldID+'_info').visible()) {
                $(fieldID+'_info').update(error);
                new Effect.Appear($(fieldID+'_info'), {duration: 0.4});
                new Effect.Appear($(fieldID+'_icon'), {duration: 0.4});
            }
            else if(error != $(fieldID+'_info').innerHTML){
                new Effect.Fade($(fieldID+'_info'), {duration: 0.2});
                setTimeout("$('"+fieldID+"_info').update(\""+error+"\");", 210);
                setTimeout("new Effect.Appear($('"+fieldID+"_info'), {duration: 0.2});", 220);
            }
        }
        else {
            new Effect.Fade($(fieldID+'_info'), {duration: 0.4});
            new Effect.Fade($(fieldID+'_icon'), {duration: 0.4});
            setTimeout("$('"+fieldID+"_info').update(''); $('"+fieldID+"_icon').update('');", 420);
            
        }
    } catch(e) {}
}