var DHTML = (document.getElementById || document.all || document.layers);

function getObj(name)	{
	  if (document.getElementById)	{    	// DOM level 1 browsers: IE 5+, NN 6+
	  	this.obj = document.getElementById(name);
		this.style = document.getElementById(name).style;
	  }
	  else if (document.all)	{  			// IE 4
		this.obj = document.all[name];
		this.style = document.all[name].style;
	  }
	  else if (document.layers)  { 			// NN 4
	   	this.obj = document.layers[name];
	   	this.style = document.layers[name];
	  }
}

// this function makes the image visible
function showpic(visiblechunk) {
		if (!DHTML){
		 alert ('Sorry, your browser can\'t show the bunny!');
		 return;
		}
		var displayedpic = new getObj(visiblechunk);
		
		displayedpic.style.visibility = 'visible';
	}
	
// this function makes the image invisible	
function hidepic(invisiblechunk) {
		if (!DHTML){
		 alert ('Sorry, your browser can\'t hide the bunny!');
		 return;
		}
	
		var hiddenpic = new getObj(invisiblechunk);
		
		hiddenpic.style.visibility = 'hidden';
	}