function MM_jumpMenu(targ,selObj,restore){
  eval(targ+".location='"+selObj.options[selObj.selectedIndex].value+"'");
  if (restore) selObj.selectedIndex=0;
}

function chkform()
{
	if(form.username.value=="")
	{
		alert("错误：请输入用户名 !");
		form.username.focus();
		return false;
	}
	
	
	if(form.password.value=="")
	{
		alert("错误：请输入密码!");
		form.password.focus();
		return false;
	}
	
 if(form.password.value.length<6)
	{
		alert("提示：登录密码不得少于6位!");
		form.password.focus();
		return false;
	}
}