function updateTips( t ) {
	tips
		.text( t )
		.addClass( "ui-state-highlight" );
	setTimeout(function() {
		tips.removeClass( "ui-state-highlight", 1500 );
	}, 500 );
}

function checkRequired( o, n, min ) {
	if ( o.val().length < min ) {
		o.addClass( "ui-state-error" );
		updateTips( "Length of " + n + " must be at least " + min + "." );
		return false;
	} else {
		return true;
	}
}

function checkLength( o, n, min, max ) {
	if ( o.val().length > max || o.val().length < min ) {
		o.addClass( "ui-state-error" );
		updateTips( "Length of " + n + " must be between " +
			min + " and " + max + "." );
		return false;
	} else {
		return true;
	}
}

function checkRegexp( o, regexp, n ) {
	if ( !( regexp.test( o.val() ) ) ) {
		o.addClass( "ui-state-error" );
		updateTips( n );
		return false;
	} else {
		return true;
	}
}