function extend(cdnum, disc) {

	switch (disc) {
		case 'a':	clearing = 'b'; break;
		case 'b':	clearing = 'a'; break;
	}
	clear = 'code' + cdnum + clearing;
	if(document.getElementById(clear)) { document.getElementById(clear).style.display = 'none'; }
	
	
	tracklist = 'code' + cdnum + disc;
	
	current = document.getElementById(tracklist).style.display;
	if(current=='none') {
		document.getElementById(tracklist).style.display = 'block';
	} else document.getElementById(tracklist).style.display = 'none'; 

	document.getElementById('trackerDiv').innerHTML = '<img src="http://secure-au.imrworldwide.com/cgi-bin/b?cg=LinkTK-Skybombers-GetCode'+cdnum+disc+'-GetCodeButton-CommunityPage-MI20071016&ci=sonybmg&tu=http://www.sonybmg.com.au/au/images/common/blank.gif">';
	
	document.getElementById(tracklist).select();
	
}