if it is mapped parametrically the texture will stretch with the object. If you want it not to stretch, but repeat itself - say along the length of a wall - then stretch it in the x or z (along the long axis of the wall) in the texture editor - the green button. There's lots of other mapping modes to play with - such as world space - which completely ignore what the object does. (world space will only work in 2 axis'hope that helps!