function switchFocus(picnum, imageID, linkID, titles) {
		if(picnum == 'firstThumbnailLink') {
			tnLinkID  = 'firstThumbnailLink';
			tnImageID = 'wk_thi0';
		} else {
			tnLinkID  = 'wk_thl'+picnum;
			tnImageID = 'wk_thi'+picnum;
		}
		var thumbImage = document.getElementById(tnImageID).src;
		var fullImage = thumbImage.replace("thumb", "full");
		
		document.getElementById(linkID).href	= fullImage;
		document.getElementById(linkID).title	= document.getElementById(tnLinkID).title;
		//document.getElementById(imageID).src	= document.getElementById(tnImageID).src;
		//document.getElementById(imageID).alt	= document.getElementById(tnImageID).alt;

		return false;

}