window.onload = externalLinks;

function externalLinks()
{
var objCurrent, objReplacement;

if (document.getElementsByTagName)
{
var objAnchors = document.getElementsByTagName('a');
for (var iCounter=0; iCounter<objAnchors.length; iCounter++)
{
if (objAnchors[iCounter].getAttribute('href') &&objAnchors[iCounter].getAttribute('rel') == 'external')
{
objAnchors[iCounter].onclick = function(event){return launchWindow(this, event);}
objAnchors[iCounter].onkeypress = function(event){return launchWindow(this, event);}

if (document.replaceChild)
{
objCurrent = objAnchors[iCounter].firstChild;
if (objCurrent.nodeType == 3) // Text node
{
objReplacement = document.createTextNode(objCurrent.data + '');
objAnchors[iCounter].replaceChild(objReplacement, objCurrent);
}
else if (objCurrent.alt) // Current element is an image
{
objReplacement = objCurrent;
objReplacement.alt = objCurrent.alt +  '';
try
{
objAnchors[iCounter].replaceChild(objReplacement, objCurrent);
}
catch(e){}

}
}
}
}
}
}

function launchWindow(objAnchor, objEvent)
{
var iKeyCode;

if (objEvent && objEvent.type == 'keypress')
{
if (objEvent.keyCode)
iKeyCode = objEvent.keyCode;
else if (objEvent.which)
iKeyCode = objEvent.which;

if (iKeyCode != 13 && iKeyCode != 32)
return true;
}

return !window.open(objAnchor);
}