functionchecks(form) { checkmail=form.BM_Email.value; if(form.BM_Name.value=="") { alert("姓名不能为空！"); returnfalse; } elseif(form.BM_Address.value=="") { alert("家庭通讯住址不能为空！"); returnfalse; } elseif(form.BM_ZipCode.value=="") { alert("