function show_div(name)
  {
   document.getElementById(name).style.visibility = "visible";
  }
 
 function hide_div(name)
  {
   document.getElementById(name).style.visibility = "hidden";
  }



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

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		home_over = newImage("/images/btn-home-over.gif")
		whoweare_over = newImage("/images/btn-whoweare-over.gif");
		whatwedo_over = newImage("/images/btn-whatwedo-over.gif");
		zappacreative_over = newImage("/images/btn-zappacreative-over.gif");
		resources_over = newImage("/images/btn-resources-over.gif");	
		ourclients_over = newImage("/images/btn-ourclients-over.gif");	
		contactus_over = newImage("/images/btn-contactus-over.gif");	

		preloadFlag = true;
	}
}