Error: 1 is not a valid mysql link resource

Hi all. With php version 4.0.1, I made a database class. I use a function called connect() to open database connection to mysql, and the link resource is stored in $GLOBALS["CONNETION_ID"] global variable. All of code work perfectly, with no any problems.. But when I upgraded to php version 4.0.6, the code wasn't work at all. The error returned is Warning: 1 is not a valid MySQL-Link resource in /usr/local/apache/htdocs/Produtora/manole/config/site/database.class.php on line 190 the line 190, in this case, is just $data = mysql_query($sql, $GLOBALS["CONNECTION_ID"]) it is the same code that works with php 4.0.1,, The link resource is valid ( at least I think that ), because when I do echo $GLOBALS["CONNECTION_ID"]; the return is Resource id #1 does anyone knows the problem??? thanks anyway, Rafael Steil