OpenGL newbie question

i have some texture (loaded by IMG_Load(“something.tga”) ) it is RGBA.
Than if i show GL_QUAD with this texture i want it to respect Alpha
channel. Should i use glEnable(GL_BLEND) and glBlendFunc(…,…)??
if so what parametrs may i send to glBlendFunc? I tried vary combinations
and i wasn’t able to make it correct. Please help.
Thanks Jan Kratochvil