mssql_result() error

ik krijg een error bij deze code maar kan hem niet opsporen..

de error is..
Fatal error: Call to undefined function: mssql_result() in (...) on line 388

<?php

$sql = mssql_query("SELECT count(*) FROM MEMB_STAT WHERE ConnectStat = 1");

if( mssql_result($sql, 0, 0) <= 80){
echo "<font color=green>";
echo 'mssql_result($sql, 0, 0)';}

elseif( mssql_result($sql, 0, 0) >= 80 AND mssql_result($sql, 0, 0) <= 150){
echo "<font color=orange>";
echo 'mssql_result($sql, 0, 0)';}

elseif( mssql_result($sql, 0, 0) > 150){
echo "<font color=red>";
echo 'mssql_result($sql, 0, 0);}' ?>