function SubmitForm(id)
{
 document.getElementById(id).submit();
}

function ValidateRequiredFields(fields, form_id)
{
var errors = [];
var j = 0;

    for(i = 0; i < fields.length; i++)
    {
        if(document.getElementById(fields[i][0]).value == '')
        {
            errors[j] = fields[i][1];
            j++;
        }
    }
        
    //Display errors
    if(errors.length > 0)
    {
        var errors_s = '<ul>';
    
        //Loop trough errors
        for(i = 0; i < errors.length; i++)
            errors_s += '<li>' + errors[i] + '</li>';
            
        errors_s += '</ul>';
        
        document.getElementById('errors').innerHTML = errors_s;
    }
    
    //Submit form
    else
        SubmitForm(form_id);     
}