String.prototype.trim = function () {
    return this.replace(/^\s*/, "").replace(/\s*$/, "");
}


function loginValidator()
{
 	var usrField = document.getElementById("LoginUsername");
	var passwdField = document.getElementById("txtPassword"); 
	
	var username = new String(usrField.value);
	var passwd =new String(passwdField.value);
	
	if(username.trim() == "")
	{ 
	 
	  alert('Username can not be blank');
	  usrField.value = '';
	  usrField.focus();
	  return false;
	}
	if(passwd.length <5)
	{
	  alert('Password can not be blank and at least 5 chararacters length');
	  passwdField.value = '';
	  passwdField.focus();
	  return false;
	}
	else
	 return true;
}