function testWidth()
{
	if (screen.width < 1200)
	{
		document.getElementById('top').style.backgroundImage = "url('../images/black.gif')";
		
	}
	if (!document.getElementsByTagName) return;
		 var anchors = document.getElementsByTagName("a");
		 for (var i=0; i<anchors.length; i++) {
		   var anchor = anchors[i];
		   if (anchor.getAttribute("href") &&
		       anchor.getAttribute("rel") == "nofollow")
		     anchor.target = "_blank";
		 }
}

function showMenu(item_id)
{
	var item = document.getElementById(item_id);
	if (item.style.display == 'none')
	{
		item.style.display = 'block';
	}
	else
	{
		item.style.display = 'none';
	}
}

function changeMenu(item_id, image)
{
	var item = document.getElementById(item_id);
	item.src = 'images/'+image;
	
}
window.onload = testWidth;