function checkBrowserWidth()
{
    var theWidth = getBrowserWidth();

    if (theWidth > 850){
        setStylesheet("Advanced");
    } else {
        setStylesheet("Basic");
    }

    return true;
}

function getBrowserWidth()
{
    if (window.innerWidth){

        return window.innerWidth;

    } else if (document.documentElement && document.documentElement.clientWidth != 0){

        return document.documentElement.clientWidth;

    } else if (document.body){

        return document.body.clientWidth;
    }

    return 0;
}

function setStylesheet(styleTitle)
{
    var currTag;

    if (document.getElementsByTagName){
        for (var i = 0; (currTag = document.getElementsByTagName("link")[i]); i++){
            if (currTag.getAttribute("rel").indexOf("style") != -1 && currTag.getAttribute("title")){

                currTag.disabled = true;

                if(currTag.getAttribute("title") == styleTitle){
                    currTag.disabled = false;
                }
            }
        }
    }

    return true;
}