function validateLicense(arg) {

  var valid_license_1 = new RegExp("^[0-9\-]{3,7}[0-9A-Za-z]{2}$");
  var valid_license_2 = new RegExp("[1-9]");
	
	if (valid_license_1.test(arg) && valid_license_2.test(arg)) {
	  return true;
	}	else {
	  return false;
	}
}

function validateLicense2(arg) {
	
	if (arg.length > 2 && arg.length < 21) {
	  return true;
	}	else {
	  return false;
	}
}

function ValidateForm() {
 license_error = "";

 if (document.forms[0].txtLicense.value != undefined && document.forms[0].txtLicense.value != "") {
   if (validateLicense2(document.forms[0].txtLicense.value)) {
  
	 } else {
     license_error = "Sorry, the license number you entered is not valid. Please try again.\n";
   }
 } else {
   license_error = "Sorry, license number is required. Please enter your license number and try again.\n";
 }

 if (license_error != "") {
   alert(license_error);
	 document.forms[0].txtLicense.focus();	
 }
 
 return (license_error == "");
}