pictures not coming across in email

I have winxp, but, some of my email budddies have 98 & some have xp. The problem is sometimes when I receive email, the pictures do not show. All that is there is a red x. I havent noticed it happening on my end when I send, but, mostly when email is received that contain pictures or gifs. This doesnt happen all the time, though. Please enlighten me, so I can forward information to my buddies..Thank you...Donna

 

Sorry,but, I looked further thru your other posts. I am getting better at this... I will try the information I read. Thank you...