function show_data(url, width, height)
{
   var a
   var b
   var url
   vidWindowWidth=width;
   vidWindowHeight=height;
   a=(screen.height-vidWindowHeight)/4;
   b=(screen.width-vidWindowWidth)/3;
   features="top="+a+",left="+b+",width="+vidWindowWidth+",height="+vidWindowHeight+",toolbar=no,menubar=no,location=no,directories=no,scrollbars=yes,resizable=no";
   window.open(url,'_blank',features,true);
   return false;
}

function display_obj(obj_id)
{
	var obj = document.getElementById(obj_id);
	obj.style.display = (obj.style.display == 'block') ? 'none' : 'block';
}

function change_image(img)
{
	main_img.src="/img/products/" + img;
}