function openInNewWindow(oLink)
{  
	var newWindow = window.open(oLink.getAttribute('href'), '_blank'); 
	newWindow.focus(); 
	return false; 
}

function preparePopupLinks()
{
  if( document.getElementById && document.getElementsByTagName )
  {
  	var links = document.getElementsByTagName( 'a' );
  	for( var i=0; i < links.length; i++ )
    {
    	if (links[i].className == 'extern')
    	{
    		links[i].onclick = function()
    		{
          openInNewWindow(this);
          return false;
        };
    	}
    }
  }
}