if (document.images)
	{
	
	b_microscopeson= new Image(164,40);
	b_microscopeson.src="images/b_microscopes_on.gif";  
	b_microscopesoff= new Image(164,40);
	b_microscopesoff.src="images/b_microscopes_off.gif";
	b_microscopesmessage= "Microscopes";	

	b_slideson= new Image(164,35);
	b_slideson.src="images/b_slides_on.gif";  
	b_slidesoff= new Image(164,35);
	b_slidesoff.src="images/b_slides_off.gif";
	b_slidesmessage= "Slides";

	b_toolson= new Image(164,34);
	b_toolson.src="images/b_tools_on.gif";  
	b_toolsoff= new Image(164,34);
	b_toolsoff.src="images/b_tools_off.gif";
	b_toolsmessage= "Tools";

	b_solventson= new Image(164,37);
	b_solventson.src="images/b_solvents_on.gif";  
	b_solventsoff= new Image(164,37);
	b_solventsoff.src="images/b_solvents_off.gif";
	b_solventsmessage= "Solvents";

	}


function activate(imgName)
	{
	if (document.images)
		{
		imgOn=eval(imgName + "on.src");
		document[imgName].src= imgOn;
		imgMess=eval(imgName + "message");
		window.status=imgMess;
		}
	}

function deactivate(imgName)
	{
	if (document.images)
		{
		imgOff=eval(imgName + "off.src");
		document[imgName].src= imgOff;
		window.status="";
		}
	}