function change_a(num)
{
if (num==1){
document.getElementById('news_1').style.display='block';

document.getElementById('a_link_2').style.fontWeight='100';
document.getElementById('news_2').style.display='none';
document.getElementById('news_3').style.display='none';
document.getElementById('news_4').style.display='none';
document.getElementById('news_5').style.display='none';
document.getElementById('a_link_1').style.background='url(images/a2.gif) no-repeat top';
document.getElementById('a_link_2').style.background='url(images/a1.gif) no-repeat top';
document.getElementById('a_link_3').style.background='url(images/a1.gif) no-repeat top';
document.getElementById('a_link_4').style.background='url(images/a1.gif) no-repeat top';
document.getElementById('a_link_5').style.background='url(images/a1.gif) no-repeat top';
}
if (num==2){
document.getElementById('news_2').style.display='block';

document.getElementById('a_link_1').style.fontWeight='100';
document.getElementById('news_1').style.display='none';
document.getElementById('news_3').style.display='none';
document.getElementById('news_4').style.display='none';
document.getElementById('news_5').style.display='none';
document.getElementById('a_link_2').style.background='url(images/a2.gif) no-repeat top';
document.getElementById('a_link_1').style.background='url(images/a1.gif) no-repeat top';
document.getElementById('a_link_3').style.background='url(images/a1.gif) no-repeat top';
document.getElementById('a_link_4').style.background='url(images/a1.gif) no-repeat top';
document.getElementById('a_link_5').style.background='url(images/a1.gif) no-repeat top';
}

if (num==3){
document.getElementById('news_3').style.display='block';

document.getElementById('a_link_1').style.fontWeight='100';
document.getElementById('news_2').style.display='none';
document.getElementById('news_1').style.display='none';
document.getElementById('news_4').style.display='none';
document.getElementById('news_5').style.display='none';
document.getElementById('a_link_3').style.background='url(images/a2.gif) no-repeat top';
document.getElementById('a_link_2').style.background='url(images/a1.gif) no-repeat top';
document.getElementById('a_link_1').style.background='url(images/a1.gif) no-repeat top';
document.getElementById('a_link_4').style.background='url(images/a1.gif) no-repeat top';
document.getElementById('a_link_5').style.background='url(images/a1.gif) no-repeat top';
}

if (num==4){
document.getElementById('news_4').style.display='block';

document.getElementById('a_link_1').style.fontWeight='100';
document.getElementById('news_2').style.display='none';
document.getElementById('news_1').style.display='none';
document.getElementById('news_3').style.display='none';
document.getElementById('news_5').style.display='none';
document.getElementById('a_link_4').style.background='url(images/a2.gif) no-repeat top';
document.getElementById('a_link_2').style.background='url(images/a1.gif) no-repeat top';
document.getElementById('a_link_1').style.background='url(images/a1.gif) no-repeat top';
document.getElementById('a_link_3').style.background='url(images/a1.gif) no-repeat top';
document.getElementById('a_link_5').style.background='url(images/a1.gif) no-repeat top';
}

if (num==5){
document.getElementById('news_5').style.display='block';

document.getElementById('a_link_1').style.fontWeight='100';
document.getElementById('news_2').style.display='none';
document.getElementById('news_1').style.display='none';
document.getElementById('news_3').style.display='none';
document.getElementById('news_4').style.display='none';
document.getElementById('a_link_5').style.background='url(images/a2.gif) no-repeat top';
document.getElementById('a_link_2').style.background='url(images/a1.gif) no-repeat top';
document.getElementById('a_link_1').style.background='url(images/a1.gif) no-repeat top';
document.getElementById('a_link_3').style.background='url(images/a1.gif) no-repeat top';
document.getElementById('a_link_4').style.background='url(images/a1.gif) no-repeat top';
}



}