Broccoli - Bacon - Raisin Salad

1 bunch broccoli
1/2 c. red onion
1 c. celery
1 lb. fried bacon
1/2 c. sunflower seeds
1/2 c. raisins

Dressing:
3/4 c. mayonaise
1/4 c. sugar
2 T. vinegar
Mix and chill.