javascript - Style switcher help -

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i need have made style switcher, cannot work out how replace stylesheet, @ moment code empties <head> need replace previous stylesheet, code,

menu , javascript

<ul id="options"> <li><a class="option" href="<?php echo base_url();?>welcome/setbackground/red">red</a></li> <li><a class="option" href="<?php echo base_url();?>welcome/setbackground/green">green</a></li> 

<script type="text/javascript"> $('a.option').click(function(ev) {     ev.preventdefault();     var url = $(this).attr("href");     alert(url)     $.ajax({         url : url,         type : "post",         data : "js=true",     success : function(html) {         $('head').html(html);     }     }); }); </script>

php

function setbackground() {     $data['style'] = $this->uri->segment(3);     $_cookie[] = setcookie("style", $data['style'], time()+(60*60*24*30), "/");     //die(print_r($_cookie));     if($this->input->post('js') == "true") {         //echo $data['style'];         $this->load->view('base/cssselector', $data);     } else {         redirect(base_url().'welcome');     } }

html javascript , php build

<link rel="stylesheet" href="/media/css/<?php echo $style; ?>.css" media="screen, projection" />

here html page shows example on how add/remove styles dynamically.

<html> <head>     <title>add/remove style</title>     <script>         function removestyle(id){             var cs = document.getelementbyid(id);             cs && cs.parentnode.removechild(cs);         }         function addstyle(css, id){             removestyle(id);             var stylenode = document.createelement("style");             stylenode.setattribute('type', 'text/css');             stylenode.setattribute('id', id);             document.getelementsbytagname("head")[0].appendchild(stylenode);             if(typeof stylenode.stylesheet !=='undefined'){                 stylenode.stylesheet.csstext = css; //ie             }else{                 stylenode.appendchild(document.createtextnode(css));             }         }     </script> </head> <body>     <p>text color</p>     <input onclick="addstyle('p{color:#900}p{background:#def}', 'mystyle')" type="button" value="add style" >     <input onclick="removestyle('mystyle')" type="button" value="remove style"> </body> </html>

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