function newImage(arg) 
{ 
	if (document.images) 
	{ 
		rslt = new Image(); 
		rslt.src = arg; 
		return rslt; 
	} 
} 

function changeImg(image_id,img_new_src)
{
	document.getElementById(image_id).src = img_new_src;	
}

function change_alpha(img)
{
 	new Effect.Opacity(img, {from: 0.8, to: 1});
}