function InsertBrowserSpecCSS()
{
    var agt=navigator.userAgent.toLowerCase();
    if(agt.Contains("msie 6."))
    {
        CSS.load("/css/style_ie6.css");
    }
    else if(agt.Contains("msie 7."))
    {
        CSS.load("/css/style_ie7.css");
    }
    else if(agt.Contains("firefox"))
    {
        CSS.load("/css/style_firefox.css");
    }
    else if(agt.Contains("safari"))
    {
        CSS.load("/css/style_safari.css");
    }
}
var CSS = {

        load: /*static*/ function (url_)
        {
                // We are preventing loading a file already loaded
                var _links = document.getElementsByTagName("link");
                var _head = document.getElementsByTagName("head")[0];               
                var removeLater=null;
                // Loop through the length of the links
                for( i = 0; _links.length > i; i++)
                {
                    // If the href is already present, remove it
                   var lastQi = _links[i].href.lastIndexOf('?');
                   var lastQu = url_.lastIndexOf('?');
                   
                   var compi = _links[i].href.substring(0, lastQi);
                    if (compi.indexOf(url_)!=-1)
                    {
                        removeLater = _links[i]; 
                    }
                }

                // Build link element
                var _elstyle = document.createElement("link");
                _elstyle.setAttribute("rel", "stylesheet");
                _elstyle.setAttribute("type", "text/css");
                _elstyle.setAttribute("href", url_ + '?'+(Math.random()*9999).toString());

                // Add style
                _head.appendChild(_elstyle);
               if(removeLater !==null)
                {
                   window.setTimeout(function(){_head.removeChild(removeLater);},350);
               }
        }
};