$("table").delegate("tr","click",function(e){
checkbox=$(this).children().first().children()[0];
alter=$(this).children().eq(8).children().children()[0];
delet=$(this).children().last().children().children()[0];
if(e.target!=checkbox&&e.target!=alter&&e.target!=delet){
rollcall_id=$(this).children().first().children().val()
open("/Student/student?sid="+rollcall_id,"mframe");
}
});