function show_faq(faq_num)
{
	var coll = document.getElementsByTagName("div");
	for(var i = 0; i < coll.length; i++)
	{
    	if(coll[i].className.toLowerCase() == 'faq_topic')
    	{
        	coll[i].style.display = "none";
     	}
  	}
	document.getElementById(faq_num).style.display = "block";
}