Afghans are expecting trouble when voting gets underway in Saturday's presidential elections.<br/> <br />The Taliban's pledged to disrupt the polls through a campaign of bombings and killings.<br/> <br />Outgoing President Hamid Karzai is urging the nation to respond to the threat by making sure they turn out to vote.<br/> <br />(SOUNDBITE)(Dari) AFGHAN PRESIDENT HAMID KARZAI SAYING:<br/> <br />"The significant participation of our people in this election will be the biggest guarantee of the continuation of the Islamic Republic of Afghanistan. A strong participation will be the greatest response to those who believe violence and destruction will act as a deterrent against our people."<br/> <br />Security's been beefed up in the capital on the eve of the election.<br/> <br />A day earlier ballot boxes started arriving at polling stations around the country.<br/> <br />There are nearly 28, 500 polling centres.<br/> <br />At least ten per cent are expected to be closed because of security threats.<br/> <br />The vote will be monit
