simple bash script permission

I have a bash script, but it needs to have a simple protection with password.
So if a user wants to run the script , there should be a kdialog to asks for a password.If the password is correct the script starts to run.
It should not be the passord of root or another admin user.Just a password in the script of taken from a password file that i create myself.
The reasion is that I wont have to configure rights on the linux system.It is not a dangerous script, just for configuring sound devices.

gtkdialog has everything you could need, but it's not K.

Xdialog