diff --git a/main.py b/main.py
index 8b1870e..8a4d453 100644
--- a/main.py
+++ b/main.py
@@ -3,6 +3,7 @@ import tkinter.messagebox
 import tkinter.simpledialog
 import gemini
 import renderEngine
+import urllib.parse
 
 # See https://tildegit.org/solderpunk/gemini-demo-1/src/branch/master/gemini-demo.py
 
@@ -16,6 +17,13 @@ class Application():
 
     def updateContent(self):
         # Get url asked
+        url=self.nav_bar.getURL()
+
+        # Is it a Gemini URL
+        if not(verifyURL(url)):
+            tkinter.messagebox.showerror("URL error", url+" is not a correct Gemini URL ! (HTTP/S is not supported, please use a web browser instead)")
+            return
+
         self.current_URL = self.nav_bar.getURL()
 
         # New request
@@ -41,6 +49,39 @@ class Application():
         else:
             self.content.setContent(r.content)
 
+    def linkClick(self, url):
+        # Check if it is an absolute URL
+        if "://" in url:
+            # Check if it is a gemini URL
+            if verifyURL(url):
+                self.nav_bar.URL_var.set(url)
+                self.updateContent()
+            # Else show error
+            else:
+                tkinter.messagebox.showerror("URL error", url+" is not a correct Gemini URL ! (HTTP/S is not supported, please use a web browser instead)")
+        # It is relative
+        else:
+            # Join current URL and relative path
+            base = self.current_URL
+            base = base.replace("gemini://","http://")
+            url = urllib.parse.urljoin(base, url)
+            url = url.replace("http://", "gemini://")
+
+            # We can verify because sometime there is errors (mailto:)
+            if verifyURL(url):
+                self.nav_bar.URL_var.set(url)
+                self.updateContent()
+            else:
+                tkinter.messagebox.showerror("URL error", url+" is not a correct Gemini URL ! (HTTP/S is not supported, please use a web browser instead)")
+
+def verifyURL(url):
+    if "://" in url:
+        parsed_url = urllib.parse.urlparse(url)
+        if parsed_url.scheme == "gemini":
+            return True
+        else:
+            return False
+
 class NavBar():
     def __init__(self, parent):
         self.parent = parent
@@ -59,7 +100,7 @@ class NavBar():
 class Content():
     def __init__(self, parent):
         self.parent = parent
-        self.root = renderEngine.Renderer(self.parent.root, "#Home page\nWelcome on tkGemini, a browser software for Gemini protocole\n=>gemini://rdelaage.ovh My gemini space")
+        self.root = renderEngine.Renderer(self.parent, "#Home page\nWelcome on tkGemini, a browser software for Gemini protocole\n=>gemini://rdelaage.ovh My gemini space")
         self.root.parse()
         self.root.content.grid(column=0, row=1)
         self.scroll_bar = tk.Scrollbar(command=self.root.content.yview, orient='vertical')
@@ -70,4 +111,8 @@ class Content():
         self.root.text = new_content
         self.root.parse()
 
+    def linkClick(self, url):
+        self.parent.nav_bar.URL_var = url
+        self.parent.updateContent
+
 app = Application()
diff --git a/renderEngine.py b/renderEngine.py
index 10268a0..2fe31b2 100644
--- a/renderEngine.py
+++ b/renderEngine.py
@@ -5,7 +5,7 @@ class Renderer():
     def __init__(self, parent, text):
         self.parent = parent
         self.text = text
-        self.content = tk.Text(self.parent)
+        self.content = tk.Text(self.parent.root)
         self.h1Font = tkFont.Font(weight="bold", size="26")
         self.content.tag_config("h1", font=self.h1Font)
         self.h2Font = tkFont.Font(weight="bold", size="20")
@@ -23,8 +23,8 @@ class Renderer():
     def addLink(self, text, url):
         index1 = str(self.currY)+'.'+str(self.currX)
         self.content.tag_config("link-"+index1, foreground="#00f", font=self.underlineFont)
-        self.content.tag_bind("link-"+index1, "<Button-1>", lambda event, url=url:
-                print(url))
+        self.content.tag_bind("link-"+index1, "<Button-1>", lambda event, url=url, parent=self.parent:
+                parent.linkClick(url))
         self.content.insert(index1, text+"\n")
         self.content.tag_add("link-"+index1, index1, str(self.currY)+'.'+str(self.currX+len(text)))
         self.currY+=1