function yanzheng(){
var username = document.forms[0].username.value;
var password = document.forms[0].password.value;

		if (username == ""){
			alert(indexLang['username']);
			document.forms[0].username.focus();
			return false;
		}
		if (password == ""){
			alert(indexLang['password']);
			document.forms[0].password.focus();
			return false;
		}
		checkuserdwr();
		    return false;
		
			return true;
}