/**
 * addEvent
 */
function addEvent(obj, evType, fn){ 
 if (obj.addEventListener){ 
	 obj.addEventListener(evType, fn, false); 
	 return true; 
 } else if (obj.attachEvent){ 
	 var r = obj.attachEvent("on"+evType, fn); 
	 return r; 
 } else { 
	 return false; 
 } 
}

/**
 * Replaces content of all the Tags with ID='ir-X' with image at 'images/X.png'
 */
function replaceTitles()
{
	// Check for DOM support
	if (!(document && document.implementation && document.implementation.hasFeature))	return;

	// Check for image support
	if (!document.images)	return;
	
	var pattern = new RegExp('ir-\w?');
	var els = document.getElementsByTagName('*');
	var elsLen = els.length;
	var tags = new Array();	

	for (i = 0, j = 0; i < elsLen; i++) {
		if ( pattern.test(els[i].id) ) {
			tags[j] = els[i];
			j++;
		}
	}	

	for (var i = 0; i < tags.length; i++)	{
		if (tags[i].id) {
			var image = document.createElement('img');
			image.src = 'images/' + tags[i].id.replace('ir-','') + '.png';
			image.alt = tags[i].firstChild.nodeValue;
			image.title = tags[i].firstChild.nodeValue;
			tags[i].replaceChild(image,tags[i].firstChild);
		}
	}
}

/** 
 * external links
 * sets \target="_blank"\ for all the links with \rel="ext"\
*/
function external_links() {
	if (!document.body.getElementsByTagName) return false;
	var as = document.body.getElementsByTagName('a');
	for(var i=0; i<as.length; i++)
		if (as[i].getAttribute('rel') == 'ext')
			as[i].target = '_blank';
	return true;
}

addEvent(window, 'load', external_links);