Name redifined

In my code I have an Include File in which I create the variables/objects to open a connection to query, edit or include redords in a database.


The code starts with:

Dim sqlData, rsTable, conn
etc....


If I insert the include file with that code in the same page twice, the system presents me the following error message:

Error Type:
Microsoft VBScript compilation (0x800A0411)
Name redefined
/mcs/atimo/Library/new.asp, line 2, column 35
dim SqlData
-----^

Is there a function that can I check if the variable/object has been defined, before I use DIM?

I tried the following and it didn't work:

if varType(Sqldata) = 0 then dim SqlData