$("#fontsizecss").attr({href:'/css/fontsize/'+$.cookie('font')+'.css'});

function switchFontsize(cssname) {
    var cssurl= '/css/fontsize/'+cssname+'.css';
    $('#fontsizecss').attr({href:cssurl});
    $.cookie('font',cssname,{expires:30,path:'/'});
}

document.write('<div id="fontsize">');
document.write('<ul>');
document.write('<li ><a href="javascript:void(0);" onclick="switchFontsize(\'small\'); return false;" class="small">小</a></li>');
document.write('<li ><a href="javascript:void(0);" onclick="switchFontsize(\'medium\'); return false;" class="medium">中</a></li>');
document.write('<li ><a href="javascript:void(0);" onclick="switchFontsize(\'large\'); return false;" class="large">大</a></li>');
document.write('</ul>');
document.write('</div>');