about emacs-x11 & gvim 's appearance

Hey all I have just turnned to SUSE10.0 from Mandriva for a few days . When I set up gvim ，I found it a little different from that I used before. The background color is gray at first , when I typed some letters in ,it turnned to white--only where the letters exist changed,. Then I installed emacs-x11 ,the situation is the same.Especially when use color-theme, the color where letters exist changed ,and the rest is still gray ,it is so ugly. Can anyone help me to make the color back to normal ?