function loadStyleSheet(id, path) { 
    if (!document.getElementById(id)) {
        var head  = document.getElementsByTagName('head')[0];
        var link  = document.createElement('link');
        link.id   = id;
        link.rel  = 'stylesheet';
        link.type = 'text/css';
        link.href = path;
        link.media = 'all';
        head.appendChild(link);
    }            
}

function LoadTheme() {
    if (global.theme == 'BROWN')
        loadStyleSheet('brownCSS', 'ext/resources/css/xtheme-brown.css');
    if (global.theme == 'GREY' || global.theme == 'GRAY')
        loadStyleSheet('brownCSS', 'ext/resources/css/xtheme-gray.css');
    if (global.theme == 'GREEN')
        loadStyleSheet('brownCSS', 'ext/resources/css/xtheme-green.css');
        
}