document.write('<link rel="stylesheet" href="'); 
    var agt=navigator.userAgent.toLowerCase(); 
    if (agt.indexOf('opera') != -1) document.write('Styles_op.css'); 
    else if (agt.indexOf('gecko') != -1) document.write('Styles_moz.css'); 
    else if (agt.indexOf('msie') != -1) document.write('Styles.css'); 
	//else if (agt.indexOf('chrome') > -1) document.write('Styles_chrome.css'); 
    else document.write('styles.css'); 
    document.write('" type="text/css">');