how to keep validation off in jquery

Question

function formsubmit(){
    var ammount = $('#ammount').val();
    var emp_status = $("input[name='empstatus']:checked").val()?$("input[name='empstatus']:checked").val():'undefined';
    var com_name = $('#com_name').val();
    var ann_inc=$('#ann_inc').val();
    var city=$('#city').val();
    var emi_paid =  $("input[name='emi_paid']:checked").val()?$("input[name='emi_paid']:checked").val():'undefined';

    flag = true;
    if (ammount.trim()=='') {
        $('#msgammount').css('color','red');
        $('#msgammount').text('Please Enter Price');
        $('#msgammount').show();
        return false;
    }
    if (emp_status == 'undefined') {
        $('#msgempstatus').css('color','red');
        $('#msgempstatus').text('Please Enter Price');
        $('#msgempstatus').show();
        return false;
    }
    if (emi_paid == 'undefined') {
        alert('undefined');
        return false;
    }
}

I want to hide the error emi_paid section as some of the user not going to fill emi_details if they not took any loan from bank, so i am using radio button if user has any existing loan then only emi option appear,

my code run well the only thing disappoint me to hide the emi_paid error, it will show always at the time of form submission.