inverse function command

[DrD]

Function Example:
y:=1/(sqrt(2*x-3));

Needed is a built in command to essentially do this:
simplify(solve(x = (1/(sqrt(2*y-3))),y))(1); // ==> (3*x^2+1)/(2*x^2)

In other words, a direct command that will return the inverse function of a function argument.

-Dale-