Are the gas laws compeletely true?

I've looked alittle at the gas laws and I get the feeling that they are simplified. From what I can see they don't take intermolecular forces into account. Will the intermolecular forces simply dissapear or just get so weak that we don't take them into account?
The gas law I'm thinking about here is mainly p1*V1/T1=p2*V2/T2 (sorry, I don't know how to write math on computers).