/**
 * @author GeekTantra
 * @date 20 September 2009
 */
var ValidationState = "valid";
(function(jQuery){
    jQuery.fn.validate = function(options){
        options = jQuery.extend({
            expression: "return true;",
            message: "",
            error_class: "ValidationErrors",
            error_field_class: "ErrorField",
            live: true
        }, options);
        var SelfID = jQuery(this).attr("id");
        if (options['live']) {
            jQuery(this).bind('blur', function(){
                validate_field(this);
            });
            jQuery(this).bind('focus keypress', function(){
                jQuery(this).next('.' + options['error_class']).fadeOut("fast", function(){
                    jQuery(this).remove();
                });
                jQuery(this).removeClass(options['error_field_class']);
            });
        }
        jQuery(this).parents("form").submit(function(){
            validate_field('#' + SelfID);
            if (ValidationState == "valid") 
                return true;
            else 
                return false;
        });
        function validate_field(id){
            var self = jQuery(id).attr("id");
            var expression = 'function Validate(){' + options['expression'].replace(/VAL/g, '$(\'#' + self + '\').val()') + '} Validate()';
            var validation_state = eval(expression);
            if (!validation_state) {
                if (jQuery(id).next('.' + options['error_class']).length == 0) {
                    jQuery(id).after('<span class="' + options['error_class'] + '">' + options['message'] + '</span>');
                    jQuery(id).addClass(options['error_field_class']);
                }
                ValidationState = "invalid";
                return false;
            }
            else {
                ValidationState = "valid";
                return true;
            }
        }
    };
})(jQuery);