Need to do a if else statement is not working please help!!!

Need to do a if else statement is not working please help!!!

<!DOCTYPE html>
<html>
<head>
<title>Jan/14</title>
<link rel="stylesheet" type="text/css" href="Cal.css">
<script src="http://code.jquery.com/jquery-1.11.0.min.js"> </script>

<script>
$(document).ready(function(){
$(".SM td").click(function(){

var SM=$("this").text();

if (SM == !"01"){

$("td:lt(02)").css("background-color","DodgerBlue");
$("td:lt(01)").css("background-color","White");
$(".MonthOne").text("FEB");
$(".miniOne").text("January");
$(".miniTwo").text("March");
$(".hum").text("Retired safely in the Boston Naval Shipyard, the U.S.S. Constitution  is the oldest commissioned naval vessel still afloat today. The gunship served from 1797 until its retirement in 1881, having fought in conflicts around the world, most notably the War The ship is still operable today and is open to the public for tours.");

}else if( SM =="02"){


$("td:lt(03)").css("background-color","DodgerBlue");
$("td:lt(02)").css("background-color","White");
 $(".MonthOne").text("MAR");
$(".miniOne").text("February");
$(".miniTwo").text("April");
}
});

});
</script>