function submitMemebershipNo(){
  if(!validateMandatoryString(document.frmLogin.txbMemNo,
                                               "Username",1))return;
  if(!validateMandatoryString(document.frmLogin.txbMemPWD,
                                               "Password",1))return;                                         
    document.frmLogin.submit();
}

function validateMandatoryString(obj, objName, option){
 if(obj.value.length == 0 && option == 1){
	 alert("ERROR: "+ objName + " is a mandatory field, Please enter data.");
    obj.select();
    obj.focus();
    return false;
 }
 if(!IsExtendedStringData(obj.value)) {
    alert("ERROR: "+ objName + " contains invalid characters, Please re-enter.");
    obj.select();
    obj.focus();
	return false;
 }
   return true;
}

function IsExtendedStringData(obj){
   var validChars = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
   var indx = 0;
   var allchars = 1;
   for (var i = 0; i < obj.length; i++) {
      if (validChars.indexOf(obj.charAt(i)) == -1) allchars = 0;
   }
   return allchars;
}