hi,
 
 In startweblogic.cmd you append 
 set path
c:\Oracle\Ora81\bin;c:\bea\wlserver6.0sp1\bin\oci816_8;%PATH%

note: instead of WL6 u can give WL5.1 path.

Also in the properties of  

driver=weblogic.jdbc.oci.Driver 
> aclName=weblogic.jdbc.connectionPool.oraclePool
> capacityIncrement=2 ini
> tialCapacity=4 url=jdbc:weblogic:oracle

Here url has to be 

url=URL="jdbc:weblogic:oracle:@Temp"

Here Temp is database which ur connecting.

Hope this helps

Thanx
Sugandha