Hyperlink in Gästebuch erstellen?

<!-- javascript for BB code !-->
<script language="JavaScript" type="text/javascript">  
function cur_ins(field, startTag, endTag, offset) {
 field.focus();
 if (document.getSelection) {
   selStart = field.selectionStart;
   selEnd = field.selectionEnd;
   text = field.value.substring(selStart, selEnd);
   field.value = field.value.substring(0, selStart) + startTag + text + endTag + 

field.value.substring(selEnd);
   if (text.length > 0) {
     if (offset != 0) {
       field.selectionStart = selStart + startTag.length + text.length - offset;
     } else {
       field.selectionStart = selStart + startTag.length + text.length + endTag.length;
     }
   } else {
      field.selectionStart = selStart + startTag.length;
   }
   field.selectionEnd = field.selectionStart;
 } else
 if (document.selection) {
     marker = document.selection.createRange();
     text = marker.text;
     marker.text = startTag+text+endTag;
     marker = document.selection.createRange();
     if (text.length > 0) {
       if (offset != 0) {
         marker.move('character', startTag.length + text.length - offset);  
       } else {
         marker.move('character', startTag.length + text.length + endTag.length + offset);  
       }
     } else {
       marker.move('character', -(endTag.length));  
     }
     marker.select();
  }
}
</script>

<form name="gb" action="formular_ausgabe.php" method="post">  
<table>
<tr>
<td> Name:</td>
<td><input type="text" name="name" size="30"></td>  
</tr>

<tr>
<td>Nachricht:</td>
<td><textarea class="text" name="post" cols="48" rows="12" ></textarea></td></tr>  

</table>
<table>
<tr><td>

<input type="button" style="color:#ffffe0; background-color:#5A8196" onmouseover="this.style.color='336699';   
this.style.backgroundColor='ffffe0';" onmouseout="this.style.color='ffffe0';   
this.style.backgroundColor='5A8196';"   value="F" onclick="cur_ins(this.form.post, '[b]', '[/b]', 0);"   
name="bold" /> </a>  


<input type="button" style="color:#ffffe0; background-color:#5A8196" onmouseover="this.style.color='336699';   
this.style.backgroundColor='ffffe0';" onmouseout="this.style.color='ffffe0';   
this.style.backgroundColor='5A8196';"  value="K" onclick="cur_ins(this.form.post, '[i]', '[/i]', 0);"   
name="italic" />  


<input type="button" style="color:#ffffe0; background-color:#5A8196" onmouseover="this.style.color='336699';   
this.style.backgroundColor='ffffe0';" onmouseout="this.style.color='ffffe0';   
this.style.backgroundColor='5A8196';"  value="U" onclick="cur_ins(this.form.post, ' [u]', '[/u]', 0);"   
name="underlined" />  

<input type="button" style="color:#ffffe0; background-color:#5A8196" onmouseover="this.style.color='336699';   
this.style.backgroundColor='ffffe0';" onmouseout="this.style.color='ffffe0';   
this.style.backgroundColor='5A8196';"  value="Z" onclick="cur_ins(this.form.post, '[z]','',  0);"   
name="umbruch" /> </a>  

<input type="button" style="color:#ffffe0; background-color:#5A8196" onmouseover="this.style.color='336699';   
this.style.backgroundColor='ffffe0';" onmouseout="this.style.color='ffffe0';   
this.style.backgroundColor='5A8196';"  value="Center" onclick="cur_ins(this.form.post, '[center]',   
'[/center]', 0);" name="Center" />   

<input type="button" style="color:#ffffe0; background-color:#5A8196" onmouseover="this.style.color='336699';   
this.style.backgroundColor='ffffe0';" onmouseout="this.style.color='ffffe0';   
this.style.backgroundColor='5A8196';"  value="IMG" onclick="cur_ins(this.form.post, '[img]', '[/img]', 0);"   
name="image" />   

<input type="button" style="color:#ffffe0; background-color:#5A8196" onmouseover="this.style.color='336699';   
this.style.backgroundColor='ffffe0';" onmouseout="this.style.color='ffffe0';   
this.style.backgroundColor='5A8196';" value="URL"  onclick="cur_ins(this.form.post, '[url]', '[/url]', 0);"   
name="hyperlink" />  

<input type="button" style="color:#ffffe0; background-color:#5A8196" onmouseover="this.style.color='336699';   
this.style.backgroundColor='ffffe0';" onmouseout="this.style.color='ffffe0';   
this.style.backgroundColor='5A8196';" value="E-Mail"  onclick="cur_ins(this.form.post, '[email]', '[/email]',   
0);" name="email" />  

<input type="button" style="color:#ffffe0; background-color:#5A8196" onmouseover="this.style.color='336699';   
this.style.backgroundColor='ffffe0';" onmouseout="this.style.color='ffffe0';   
this.style.backgroundColor='5A8196';" value="Zitat"  onclick="cur_ins(this.form.post, '[quote]', '[/quote]',   
0);" name="zitat" />  


<select  name='color'  onchange="cur_ins(this.form.post, value,   '[/color]')">  
<option value='0'>------ Farbe -------</option>  
<option style="BACKGROUND-COLOR: black" value=" [color=Black]">Black</option>  
<option style="BACKGROUND-COLOR: sienna" value=" [color=Sienna]">Sienna</option>  
<option style="BACKGROUND-COLOR: darkolivegreen" value=" [color=DarkOliveGreen]">Dark Olive Green</option>  
<option style="BACKGROUND-COLOR: darkgreen" value=" [color=DarkGreen]">Dark Green</option>  
<option style="BACKGROUND-COLOR: darkslateblue" value=" [color=DarkSlateBlue]">Dark Slate Blue</option>  
<option style="BACKGROUND-COLOR: navy" value=" [color=Navy]">Navy</option>  
<option style="BACKGROUND-COLOR: indigo" value=" [color=Indigo]">Indigo</option>  
<option style="BACKGROUND-COLOR: darkslategray" value=" [color=DarkSlateGray]">Dark Slate Gray</option>  
<option style="BACKGROUND-COLOR: darkred" value=" [color=DarkRed]">Dark Red</option>  
<option style="BACKGROUND-COLOR: darkorange" value=" [color=DarkOrange]">Dark Orange</option>  
<option style="BACKGROUND-COLOR: olive" value=" [color=Olive]">Olive</option>  
<option style="BACKGROUND-COLOR: green" value=" [color=Green]">Green</option>  
<option style="BACKGROUND-COLOR: teal" value=" [color=Teal]">Teal</option>  
<option style="BACKGROUND-COLOR: blue" value=" [color=Blue]">Blue</option>  
<option style="BACKGROUND-COLOR: slategray" value=" [color=SlateGray]">Slate Gray</option>  
<option style="BACKGROUND-COLOR: dimgray" value=" [color=DimGray]">Dim Gray</option>  
<option style="BACKGROUND-COLOR: red" value=" [color=Red]">Red</option>  
<option style="BACKGROUND-COLOR: sandybrown" value=" [color=SandyBrown]">Sandy Brown</option>  
<option style="BACKGROUND-COLOR: yellowgreen" value=" [color=YellowGreen]">Yellow Green</option>  
<option style="BACKGROUND-COLOR: seagreen" value=" [color=SeaGreen]">Sea Green</option>  
<option style="BACKGROUND-COLOR: mediumturquoise" value=" [color=MediumTurquoise]">Medium Turquoise</option>  
<option style="BACKGROUND-COLOR: royalblue" value=" [color=RoyalBlue]">Royal Blue</option>  
<option style="BACKGROUND-COLOR: purple" value=" [color=Purple]">Purple</option>  
<option style="BACKGROUND-COLOR: gray" value=" [color=Gray]">Gray</option>  
<option style="BACKGROUND-COLOR: magenta" value=" [color=Magenta]">Magenta</option>  
<option style="BACKGROUND-COLOR: orange" value=" [color=Orange]">Orange</option>  
<option style="BACKGROUND-COLOR: yellow" value=" [color=Yellow]">Yellow</option>  
<option style="BACKGROUND-COLOR: lime" value=" [color=Lime]">Lime</option>  
<option style="BACKGROUND-COLOR: cyan" value=" [color=Cyan]">Cyan</option>  
<option style="BACKGROUND-COLOR: deepskyblue" value=" [color=DeepSkyBlue]">Deep Sky Blue</option>  
<option style="BACKGROUND-COLOR: darkorchid" value=" [color=DarkOrchid]">Dark Orchid</option>  
<option style="BACKGROUND-COLOR: silver" value=" [color=Silver]">Silver</option>  
<option style="BACKGROUND-COLOR: pink" value=" [color=Pink]">Pink</option>  
<option style="BACKGROUND-COLOR: wheat" value=" [color=Wheat]">Wheat</option>  
<option style="BACKGROUND-COLOR: lemonchiffon" value=" [color=LemonChiffon]">Lemon Chiffon</option>  
<option style="BACKGROUND-COLOR: palegreen" value=" [color=PaleGreen]">Pale Green</option>  
<option style="BACKGROUND-COLOR: paleturquoise" value=" [color=PaleTurquoise]">Pale Turquoise</option>  
<option style="BACKGROUND-COLOR: lightblue" value=" [color=LightBlue]">Light Blue</option>  
<option style="BACKGROUND-COLOR: plum" value=" [color=Plum]">Plum</option>  
<option style="BACKGROUND-COLOR: white" value=" [color=White]">White</option>  
</select>


<select name='size'  onchange="cur_ins(this.form.post, value,   '[/size]')">  
<option value='0'>- Grösse -</option>  
<option value=" [size=1]">1</option>  
<option value=" [size=2]">2</option>  
<option value=" [size=3]">3</option>  
<option value=" [size=4]">4</option>  
<option value=" [size=5]">5</option>  
<option value=" [size=6]">6</option>  
<option value=" [size=7]">7</option>  
</select>

<select  name='font'  onchange="cur_ins(this.form.post, value,   '[/font]')">  
<option value='0'>--- Schrift ---</option>  
<option value=" [font=Arial]">Arial</option>  
<option value=" [font=Fixedsys]">Fixedsys</option>  
<option value=" [font=Garamond]">Garamond</option>  
<option value=" [font=Georgia]">Georgia</option>  
<option value=" [font=Impact]">Impact</option>  
<option value=" [font=System]">System</option>  
<option value=" [font=Tahoma]">Tahoma</option>  
<option value=" [font=Verdana]">Verdana</option>  
</select>



<input type="submit"  style="color:#ffffe0; background-color:#5A8196" onmouseover="this.style.color='336699';   
this.style.backgroundColor='ffffe0';" onmouseout="this.style.color='ffffe0';   
this.style.backgroundColor='5A8196';" name="submit" value="eintragen">  
</form></td></tr>