MySQL and mysql_escape_string syntax

I am performing a mysql query. Need the correct syntax so that input can have non standard characters in search (ie. apostrophe). For example, if searching John Doe's Company. The apostrophe is causing errors. Here is my code which does not work and need the % around the search term for wildcard search.
$trade_name = "%".$trade_name."%"; 
$sql = "SELECT * from doctors WHERE trade_name LIKE" . mysql_escape_string($trade_name) . "";
// also tried this
$sql = 'SELECT * from `doctors` WHERE `trade_name` LIKE \''.mysql_escape_string($trade_name).'\' LIMIT \''.$set_limit.'\', \''.$limit.'\'';

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Guy Hengel [angelIII / a3]Billing EngineerCommented:
you miss the quotes:
$sql = "SELECT * from doctors WHERE trade_name LIKE '%" . mysql_escape_string($trade_name) . "%' ";

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pdheadyAuthor Commented:
thanks that worked.
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