如何将字符串变量放在mysql_resutl字段中？

I want to run this code :

if ($_GET['CHOOSE'] == 1)
  { 
   $field = " 'col1' ";
  }
  else
  {
     $field = " 'col2 '  ";
  }

  echo mysql_result($result,0,$field);

unfortunately I got false ??

Try this

if ($_GET['CHOOSE'] == 1)
{ 
 $field = "col1";
}
else
{
 $field = "col2";
}
echo mysql_result($result,0,$field);