var tabmenu = new Array('tab1','tab2','tab3');
function showmenu(id)
{
hidealldiv();
showdiv(id);
document.getElementById(id).classname='active';
}

function hidealldiv()
{
for (i=0; i<tabmenu.length;i++)
{
hidediv(tabmenu[i]);
}
}
function hidediv(id)
{
if (document.getElementById)
{
document.getElementById(id).style.display='none';
}
}

function showdiv(id)
{
if (document.getElementById)
{
document.getElementById(id).style.display='block';
}
}

function changeblogClass(){
document.getElementById('blog').className='active';
document.getElementById('article').className='';
document.getElementById('daily').className='';
}
function articleClass(){
document.getElementById('article').className='active';
document.getElementById('blog').className='';
document.getElementById('daily').className='';
}

function dailyClass(){
document.getElementById('daily').className='active';
document.getElementById('article').className='';
document.getElementById('blog').className='';
}