Lense without IS need a tripod?

I was having my eyes on EF17-40mm f/4L USM and EF-S 10-22mm f/3.5-4.5USM but after research it dont have build in with IS. If i buy any lense that without build in IS does that mean I had to get myself a tripod because the picture will blurry?

No, it does not. You will only need a tripod if you are shooting long exposures.
If IS is so important, why have people been taking sharp photos for 100+ years? Just shoot according to the 1/equiv focal length rule and you will be right.

For those 2 lenses, 17-40 and 10-22, IS is not that important. You can usually get shutter speeds that will cancel camera shake. The general rule, I think, is: 1/focal length. So, for the 17-40 lens, at shutter speeds of 1/40 or faster, you don't need IS. And with the 10-22mm lens, shutter speeds of 1/22 (usually 1/25th) or faster and you don't need IS.

I think you can get one or both of those lenses and not worry about camera shake.

Edit: Just noticed "watchtherocks" already mentioned the 1/focal length.

You;ll only need a tripod (or flash) when lighting is bad. If you can get a 1/30 shutter speed, you should be OK.

question about the 1/focal length.

Does that only apply to what focal length you are shooting at? Say using a 70-200 lens but your shooting at 90mm... so it would be 1/90 or would you need it at 1/200 to not need IS?

it really is just a rule of thumb. Technically it just the FL you are shooting at, but if you at the 70 end of the 200, the big lens might cause more shake than if you were just using a 70mm prime. So I'd err on the faster shutter speed side when you can.

Just to add to the confusion: It's 1/effective focal lenght. So on a 1.6 crop (i assume you are shooting crop since the 10-22 is being considered) . On my 40D I aim for a 1/2 x focal lenght, so with my 85mm I go for 1/160, with the 24mm I can shoot 1/50 etc. If I lean against a door or something, I can go slower. Try shooting bursts, 2. or 3. shot are often sharper for me. YMMV.

tkbslc, the weight of a lens actually contributes to its image stabilisation properties through inertia. It's much harder to jerk around a 70-200 than it is a 50/1.8.