Check Existence of temporary table in a session.

Hi All,
I have an strange problem . I am building an application with connection pooling. I had write a stored procedure and called from JDBC. In Procedure i am creating a table (temporary). I want to check if this temporary table already exists then do not create otherwise create it. The following query fails.

Select Into DBExistsFlag 1
Where Exists (Select * from Pg_Tables Where Upper(Trim(TableName)) = Upper(Trim(''FolderTree'')));
If Not Found Then
Create Temp Table FolderTree(FolderId Int8,ParentFolderId Int8,
FolderTyp Char(1),Leaf Int4,RightFlag Char(1));
End If;
If DBExistsFlag = 1 Then
Delete From FolderTree;
End If;

When I saw the table pgadmin_tables there was entry of table name pg_temp.232667.2 The columns of this table mached with my temporary table.

My question is that if postgres converts table name to this one then how can i find that temporary table already exists so that irritating mesasage should not come.

Any help/suggesion may be benificial for me.

Thanks

Regards
Dinesh Parikh
NSTL New Delhi