function tab(tabnumber)
{
	if(tabnumber==1)
	{
		document.getElementById('pm_short').style.display = "";
		document.getElementById('pm_long').style.display = "none";
	}
	else if(tabnumber==2)
	{
		document.getElementById('pm_long').style.display = "block";
		document.getElementById('pm_short').style.display = "none";
	}
}

function changeTab(tab)
{
  
    var listItems = tab.parentNode.parentNode.childNodes;

 

    var oldLi;

    for (var i = 0; i < listItems.length; i++)

    {

        if (listItems[i].className == 'active') 

        {

             oldLi = listItems[i];

             break;

        }

    }

     

    var newLi = tab.parentNode;

    var oldTab = $(oldLi.childNodes[0]);

   

    Element.removeClassName(oldLi, 'active');

    Element.addClassName(newLi, 'active');    

    $(oldTab.rel).hide();

    var container = $(tab.rel);

    container.show();

}