// JavaScript Document
function validate(myform) {

	if (isBlank(myform.txtUserName.value)) {
		alert("Please enter a username.");
		
		myform.txtUserName.focus();
		return false;
		}
		if (hasInvalidCharacters(myform.txtUserName.value)) {
		alert("Please enter correct username.");
		myform.txtUserName.value='';
		myform.txtUserName.focus();
		return false;
		}
		if (isBlank(myform.txtPassword.value)) {
		alert("Please enter a password.");
		
		myform.txtPassword.focus();
		return false;
		}
		if (hasInvalidCharacters(myform.txtPassword.value)) {
		alert("Please enter correct password.");
		myform.txtPassword.value='';
		myform.txtPassword.focus();
		return false;
		}
		
	return true;
	}