function show_hide_desc(x) {
 	
 	a=document.getElementById('img_'+x);
 	b=document.getElementById('desc_'+x);
	
 	if (b.style.display=='none') {
 	a.src='img/down.gif';
 	b.style.display='block';
 	
 	} else {
	
	a.src='img/forward.gif';
 	b.style.display='none';
 	
 	}
 	
}


function show_alt(x){
 	b=document.getElementById('alt_'+x);
 	b.style.display='block';
}

function hide_alt(x){
 	b=document.getElementById('alt_'+x);
 	b.style.display='none';
}