function change_picture(image_name, maxwidth, maxheight, picture, width, height, alt_name, alt_text)
	{
		document.getElementById(image_name).src = picture;
		
		if(width > height){
			document.getElementById(image_name).width = maxwidth;
			document.getElementById(image_name).height = Math.round(height * (maxwidth / width));
		}else{
			document.getElementById(image_name).height = maxheight;
			document.getElementById(image_name).width = Math.round(width * (maxheight / height));	
		}
		if(alt_name != '')
			document.getElementById(alt_name).innerHTML = alt_text;
	}