// function changeImage(image)
// {
//     if (document.images) {
//         document.images['main-image'].src = image;
//     }
// }

function externalLinks()
{
    if(!document.getElementsByTagName) return;
    var anchors = document.getElementsByTagName("a");
    for(var i=0;i<anchors.length;i++)
    {
        var anchor = anchors[i];
        if(anchor.getAttribute("href") && anchor.getAttribute("rel") == "external")
            anchor.target = "_blank";
    }
}

//
// addLoadEvent()
// Adds event to window.onload without overwriting currently assigned onload functions.
// Function found at Simon Willison's weblog - http://simon.incutio.com/
//
function addLoadEvent(func)
{	
   var oldonload = window.onload;
   if (typeof window.onload != 'function'){
      window.onload = func;
   } else {
      window.onload = function(){
         oldonload();
         func();
      }
   }
}

function addUnLoadEvent(func)
{	
   var oldonunload = window.onunload;
   if (typeof window.onunload != 'function'){
      window.onunload = func;
   } else {
      window.onunload = function(){
         oldonunload();
         func();
      }
   }
}

addLoadEvent(externalLinks);