function chk_contactus(frm,isEdit)
{
    if(!notEmpty(frm.txtName,"Name"))
        return false;
    if(!notEmpty(frm.txtContactNo,"Contact no"))
        return false;
    if(!notEmpty(frm.txtEmail,"Email"))
        return false;
    if(!notEmpty(frm.txtLocation,"Location"))
        return false;
    if(!notEmpty(frm.txtSubject,"Subject"))
        return false;
    if(!notEmpty(frm.txtEnquiry,"Enquiry"))
        return false;
    else
        return true;
}