$(document).ready(function() 
{
     $("div.big_image img").each(function (i) {
       if($(this).attr("src") == null) {
            $(this).hide()
       }
     }); 
     
         
     if ($("select#select_company") != null) 
     {
          if ( $("tr#companyname_row") != null && $("select#select_company").val() == 'contractor') {
              $("tr#companyname_row").hide();
          }        
                    
          if ($("tr#companyname_row") != null) {
              $("select#select_company").change(function() {                
                if($(this).val() == "contractor") {                  
                  $("tr#companyname_row").hide();
                }
                else {
                    $("tr#companyname_row").show();
                }            
              });
          }
     }     
        
});