  Recent attempts to find a ``holographic dual'' to QCD-like theories included
a suggestion by Karsh et al (below referred to as KKSS) to incorporate
confinement via a potential quadratically increasing into the 5-th direction of
the $AdS_5$ space. We show that the same conclusion follows from completely
different line of arguments. If instantons are promoted into the 5d space by
identifying the instanton size $\rho$ at the 5-th coordinate, the background
geometry necessarily should be the AdS$_5$. As I argued already in 1999,
confinement described via ``dual superconductivity'' leads to a factor
$exp(-2\pi\sigma\rho^2)$, where $\sigma$ is a string tension, which is nearly
exactly identical to that suggested by KKSS. This expression is also well
supported by available lattice data. At the end of the paper we propose a IR
potential generalized to the nonzero temperatures.
