Maybe load jQuery from the google cdn

wp-jquery.php

<?php
/*
Plugin Name: Google jQuery CDN
*/
add_action( 'wp_enqueue_scripts', 'cd_wp_google_jquery' );
function cd_wp_google_jquery()
{	
	if( $works = get_transient( 'google_jquery_works' ) )
	{
		wp_deregister_script( 'jquery' ); 
		wp_register_script('jquery', 'http://ajax.googleapis.com/ajax/libs/jquery/1.7.0/jquery.min.js');
	}
	else
	{
		$url = 'http://ajax.googleapis.com/ajax/libs/jquery/1.7.0/jquery.min.js';
		$resp = wp_remote_get( $url );
		if( ! is_wp_error( $resp ) && 200 == $resp['response']['code'] )
		{
			set_transient( 'google_jquery_works', true, 60*60 );
			wp_deregister_script( 'jquery' ); 
			wp_register_script( 'jquery', 'http://ajax.googleapis.com/ajax/libs/jquery/1.7.0/jquery.min.js' );
		}
	}
	wp_enqueue_script('jquery');
}