Really need to know exactly which lenses you have. All modern canon autofocus lenses (EF and EF-S designated) will work with what is referred to as crop sensor bodies. E.g. All the bodies with 2,3 or 4 numbers before the D, for example 40D, 400D, 600D, 1100D. (the odd one out is the 7D, it's okay too)
If they are EF-S only lenses then they cannot be used on what is referred to as full frame
sensor cameras, (these have single digit numbering, with the exception of the 7D, see above) these are the 1D and 1Ds series, and the 5D series. These can only use EF designated lenses.