ie6     =     (parseFloat(navigator.appVersion.split("MSIE")[1]) != 6) ? false : true;
ie7     =     (parseFloat(navigator.appVersion.split("MSIE")[1]) != 7) ? false : true;
ie8     =     (parseFloat(navigator.appVersion.split("MSIE")[1]) != 8) ? false : true;
firefox =     (navigator.userAgent.indexOf("Firefox")==-1) ? false : true;
opera   =     (navigator.userAgent.indexOf("Opera")  ==-1) ? false : true;
chrome  =     (navigator.userAgent.indexOf("Chrome")  ==-1) ? false : true;

function loadCSS () {
    link = document.getElementById('cssLink');
    if (ie6)    {link.href = 'css/mcpIE6.css'}
    if (ie7)    {link.href = 'css/mcpIE7.css'}
    if (ie8)    {link.href = 'css/mcpIE8.css'}
    if (opera)  {link.href = 'css/mcpOpera.css'}
    if (chrome) {link.href = 'css/mcpChrome.css'}
}

loadCSS();