// JavaScript Document
function changeImg(){   
    var imgSrc = $("#imgObj");   
    var src = imgSrc.attr("src");   
    imgSrc.attr("src",chgUrl(src));   
}   
//时间戳   
//为了使每次生成图片不一致，即不让浏览器读缓存，所以需要加上时间戳   
function chgUrl(url){   
    var timestamp = (new Date()).valueOf();   
    url = url.substring(0,22);   
    if((url.indexOf("&")>=0)){   
        url = url + "×tamp=" + timestamp;   
    }else{   
        url = url + "?timestamp=" + timestamp;   
    }   
    return url;   
}   
  
function isRightCode(){   
    var code = $("#veryCode").attr("value");   
    code = "c=" + code;   
    var result = false;
	$.ajax({   
        type:"POST",   
        url:"/resultServlet.jsp",
		async: false,
        data:code,   
        success:function(data){
			$("#info").html(data);
			if(data.indexOf('正确')>=3){
				result = true
			}
		}
    }); 
	return result;
}   
  
function callback(data){   
    $("#info").html(data);
	if(data=='验证码正确')
		return true;
	else
		return false;
}