class beg
------------------
class beg { 
    function setinst($instance){ 
        $this->instance = $instance; 
    } 
    function setusr($user){ 
        $this->user = $user; 
    } 
} 

file one
------------------
$beg = new beg; 
$beg->setinst("localhost"); 

file two
------------------
if(class_exists("beg")){
	$beg2 = new beg; 
	$beg2->setinst("localhost"); 
}else{
	require_once("scrs/beg.class.php"); 
}
// jst used this if to see if class exists