тези редове ги смени
$sql_connect = mssql_connect($dbhost,$dbuser,$dbpass) or die ('Can\'t connect to mssql server!'); // Не пипайте тук!
mssql_select_db($dbase,$sql_connect) or die ('Can\'t connect to mssql database!'); // Тук също!
с тези
mssql_connect($dbhost,$dbuser,$dbpass) or...