// 登陆验证
<!--
function checklog()
{
if(form_log.username.value.length == 0)
	{
		alert("请输入用户名。");
    	form_log.username.focus();
    	return false;	
	}
	if(form_log.password.value.length == 0 )    
    {            
    	alert("请输入密码");            
    	form_log.password.focus();            
    	return false;    
    }
	if(form_log.safe.value.length == 0 )    
    {            
    	alert("请输入验证码");            
    	form_log.safe.focus();            
    	return false;    
    }
 return true;
}
-->