function showPic (whichpic) { 
	if (document.getElementById) { 
		document.getElementById('screen_holder').src = whichpic.href.replace(".png","_tb.png"); 
		document.getElementById('screen_enlarge').href = whichpic.href;
		document.getElementById('screen_enlarge_img').href = whichpic.href;
		if (whichpic.title) { 
			document.getElementById('screen_desc').childNodes[0].nodeValue = whichpic.title; 
			document.getElementById('screen_holder').alt = whichpic.title; 
		} else { 
			document.getElementById('screen_desc').childNodes[0].nodeValue = whichpic.childNodes[0].nodeValue; 
			document.getElementById('screen_holder').alt = whichpic.title; 
		} 
		return false; 
	} else { 
		return true; 
	} 
}