clean.js

$(".views-exposed-form #edit-cor .form-item label").each(function(){
   var color = $(this).text();
   $(this).parent('div.form-item').addClass(filterColor(color));
});

function filterColor(color){
    if(typeof color === 'string'){
        if($.inArray(color, Drupal.settings.avanz.colors)!== -1){
            return cleanString(color.toLowerCase().replace(/ +/g, "-"));
        }
    }
}

function cleanString(string){
    var str = string.split("");
    for(var x = 0;x<str.length;x++){
        var c = str[x];
        if(c == 'á'){
            str[x] = 'a';
        }
    }

    return str.join("");
}