function add(F){ 
x_populate(print1);
}

function print1(N1) {
    document.write(N1);
    document.write('Its Me');
} 

my $msub = sub {
	return 'Hey';
};

Sajax::rs_init();
Sajax::rs_register("populate",$msub);
//followed by some other Sajax functions


//calling add() function
<SELECT NAME="selectCourseDept" onChange="add(); return false;">