function file_exists (url , sty) 
{
    if(sty != "")
    {
        url = url + sty;
        var req = this.window.ActiveXObject ? new ActiveXObject("Microsoft.XMLHTTP") : new XMLHttpRequest();
        if (!req) {throw new Error('XMLHttpRequest not supported');}
        req.open('HEAD', url, false);
        req.send(null); 
        
        if (req.status == 200)
        {
          return true;
        }
        return false;
    }
    return false;
    
}

var UrlEstilos = "skin/frontend/quiero_chocolate/default/css/";
var StyleIe8 = "style-ie8.css";
var StyleIe7 = "style-ie7.css";
var StyleIe6 = "style-ie8.css";
var StyleChrome = "";
var StyleSafari = "";
var StyleMozilla = "";
var StyleOpera = "";
var StyleNetscape = "";
var StyleKonqueror = "";
var StyleMozilla = "";
 


 

//Ejecutamos las condiciones si el fichero existe o no.
$(document).ready(function()
{
           BrowserDetect.init();
       
     
           if(BrowserDetect.browser == "Explorer")
           {
                if(BrowserDetect.version == "8")
                {
                     if(file_exists(UrlEstilos , StyleIe8) )
                     { 
                         $('head').append('<link rel="stylesheet" href="' + UrlEstilos + StyleIe8 + '" type="text/css" />'); 
                     }
                     
                }
                else  if(BrowserDetect.version == "7")
                {
                     if(file_exists(UrlEstilos , StyleIe7) )
                     {
                        $('head').append('<link rel="stylesheet" href="' + UrlEstilos + StyleIe7 + '" type="text/css" />');
                     }
                      
                }
                else  if(BrowserDetect.version == "6")
                {
                     if(file_exists(UrlEstilos , StyleIe6) )
                     {
                        $('head').append('<link rel="stylesheet" href="' + UrlEstilos + StyleIe6 + '" type="text/css" />');
                     }  
                }
           }
                
          else if(BrowserDetect.browser == "Firefox")
          { 
                if(file_exists(UrlEstilos , StyleMozilla) )
                {
                 
                   $('head').append('<link rel="stylesheet" href="' + UrlEstilos + StyleMozilla + '" type="text/css" />'); 
                }  
                
          }
          else if(BrowserDetect.browser == "Chrome")
          { 
                if(file_exists(UrlEstilos , StyleChrome) )
                {
                   $('head').append('<link rel="stylesheet" href="' + UrlEstilos + StyleChrome + '" type="text/css" />'); 
                }   
          }
          else if(BrowserDetect.browser == "Safari")
          { 
                if(file_exists(UrlEstilos , StyleSafari) )
                {
                    $('head').append('<link rel="stylesheet" href="' + UrlEstilos + StyleSafari + '" type="text/css" />'); 
                }     
          }
          else if(BrowserDetect.browser == "Opera")
          {
          
                if(file_exists(UrlEstilos , StyleOpera) )
                {
                    $('head').append('<link rel="stylesheet" href="' + UrlEstilos + StyleOpera + '" type="text/css" />'); 
                }     
          }    
          else if(BrowserDetect.browser == "Netscape")
          {
           
                if(file_exists(UrlEstilos , StyleNetscape) )
                {
                    $('head').append('<link rel="stylesheet" href="' + UrlEstilos + StyleNetscape + '" type="text/css" />'); 
                }     
          }    
          else if(BrowserDetect.browser == "Konqueror")
          {
           
                if(file_exists(UrlEstilos , StyleKonqueror) )
                {
                    $('head').append('<link rel="stylesheet" href="' + UrlEstilos + StyleKonqueror + '" type="text/css" />'); 
                }       
          }    
          else if(BrowserDetect.browser == "Mozilla")
          {
           
                if(file_exists(UrlEstilos, StyleMozilla) )
                {
                    $('head').append('<link rel="stylesheet" href="' + UrlEstilos + StyleMozilla + '" type="text/css" />'); 
                }     
          } 
});