diff --git a/controller/visitor.go b/controller/visitor.go
index 443fa72..6a5fd78 100644
--- a/controller/visitor.go
+++ b/controller/visitor.go
@@ -2,13 +2,11 @@ package controller
 
 import (
 	"encoding/json"
-	"fmt"
 	"github.com/gin-gonic/gin"
 	"github.com/taoshihan1991/imaptool/common"
 	"github.com/taoshihan1991/imaptool/models"
 	"github.com/taoshihan1991/imaptool/tools"
 	"github.com/taoshihan1991/imaptool/ws"
-	"math/rand"
 	"strconv"
 )
 
@@ -60,7 +58,14 @@ import (
 //}
 func PostVisitorLogin(c *gin.Context) {
 	ipcity := tools.ParseIp(c.ClientIP())
-	avator := fmt.Sprintf("/static/images/%d.jpg", rand.Intn(14))
+	avator:=""
+	userAgent := c.GetHeader("User-Agent")
+	if tools.IsMobile(userAgent) {
+		avator = "/static/images/phone.png"
+	} else {
+		avator = "/static/images/computer.png"
+	}
+
 	toId := c.PostForm("to_id")
 	id := c.PostForm("visitor_id")
 
diff --git a/static/css/common.css b/static/css/common.css
index ab88075..b059e6d 100644
--- a/static/css/common.css
+++ b/static/css/common.css
@@ -393,7 +393,10 @@ a{color: #07a9fe;text-decoration: none;}
 }
 
 .chatTitle{height: 30px;line-height: 30px;color: #1989fa}
-.chatBoxSend{background: #fff;height: 100px;}
+.chatBoxSend{
+    background: #fff;height: 100px;
+    position: relative;
+}
 .chatBoxSendBtn{float: right;margin: 12px 4px 0 0;}
 .footContact{text-align: center;}
 .footContact a{font-size: 12px;color: #999;text-decoration: none;}
diff --git a/static/images/computer.png b/static/images/computer.png
new file mode 100644
index 0000000..8cd7fd6
Binary files /dev/null and b/static/images/computer.png differ
diff --git a/static/images/phone.png b/static/images/phone.png
new file mode 100644
index 0000000..3318a0b
Binary files /dev/null and b/static/images/phone.png differ
diff --git a/tools/http.go b/tools/http.go
index e99101f..bbd8050 100644
--- a/tools/http.go
+++ b/tools/http.go
@@ -3,6 +3,7 @@ package tools
 import (
 	"io/ioutil"
 	"net/http"
+	"regexp"
 	"strings"
 )
 
@@ -50,3 +51,11 @@ func PostHeader(url string, msg []byte, headers map[string]string) (string, erro
 	}
 	return string(body), nil
 }
+func IsMobile(userAgent string) bool {
+	mobileRe, _ := regexp.Compile("(?i:Mobile|iPod|iPhone|Android|Opera Mini|BlackBerry|webOS|UCWEB|Blazer|PSP)")
+	str := mobileRe.FindString(userAgent)
+	if str != "" {
+		return true
+	}
+	return false
+}
\ No newline at end of file