how to "catch" an eror?

[pelegk1]

i know that in php if an error occurs there is (if i define so)
when ever there is an error the error function is called andthere i handle it withoguth!!! any error message will be printed to the user!
how do i do the same in asp/?

[pelegk1]

was that in php when an error accures a function that i deine is being called when an error hapend

[pelegk1]

what i want is when an error accurs a function that i decide will automaticlly will be called ,and from there for example i can report the error!
thanks
peleg