problems accesing an object via globals

[julian <correojulian33-php@xxxxxxxx>]

I want to open a database connection at program initialization and use 
that very same connection via globals initilizating ( loading from db) 
other objects.

Basically

index.php

$db=new mysqli(host,us,pass,db);

if(mysqli_connect_errno()){
	die('errordb conex');
}

switch ($var){

	display1:
		$obj=new obj_x();
		$obj->load();
		$obj->display();
		break;
	display2:
		$obj=new obj_y();
		$obj->load();
		$obj->display();
		break;
		
}
------------------

class obj_x{
	function load(){
		globals $db;

		$sql="select ....);
		$ret=$->query($sql); // XX
		...
		}
}

fails at XX with Warning: mysqli::query() [function.mysqli-query]: 
Couldn't fetch mysqli in class file .... line XX

Any hints ??. I am using php 5.1.6 with linux/ubuntu.

Thanks.

JCG

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