Why is this not working???

 <tr>
          <td><label for="subject">Subject</label></td>
          <td><select name="subject" id="subject" value="<?=$_SESSION['post']['subject']?>" >
          
            <option value="0" selected="selected">Choose</option>
            <option value="Question">Question</option>
            <option value="Business proposal">Business proposal</option>
            <option value="Advertisement">Advertising</option>
            <option value="Complaint">Complaint</option>
          </select>         </td>
         <td id="subjectInfo">Subject</td>
        </tr>

 var subject = $("#subject");
var subjectInfo = $("#subjectInfo");

form.submit(function(){
		if(validateName() & validateEmail() & validateSubject() & validateName() & validateName()) 
			return true
		else
			return false;
	});

function validateSubject(){
		if(this.selectedIndex > 0) {
   			subjectInfo.text("Valid");
			subjectInfo.removeClass("error");
			return true;
		} 	
		// Not valid
		else{
	  		subjectInfo.text("NOT valid");
	  		subjectInfo.addClass("error");
	  		return false;
   
  }
	}