$("#form-part4,#form-part5,#form-part6,#form-part7,#form-part8,#form-part9,#form-part10,#form-part11,#form-part12").submit(function(){

alert(this.id)

});

here each id is a individual form but for #form-part10,#form-part11,#form-part12 is taking them together.