change image thumbnail

[rambash]

i have a very important question for you?
kia hum wordpress image galleries my image thumbnail change kar sakty han?
mean suppose gallery my jo image ka original thumnail ha. us ki bjye hm koi different photo as a thumbnail use karna chahy. ya phir image title as image thumbnail use karna chahy.
in simple hum jo auto generated thumbnail ho us ko change kar k koi different image as thumbnail use karna chahy.
agr aisa posible ha to please treeka btaye

[Fida Hussain]

Good Question