if (document.images)
		{
				button1_on = new Image();
				button1_on.src = "images/whatis_on.gif";
				button2_on = new Image();
				button2_on.src = "images/whatare_on.gif";
				button3_on = new Image();
				button3_on.src = "images/howcani_on.gif";

				button1_off = new Image();
				button1_off.src = "images/whatis_off.gif";
				button2_off = new Image();
				button2_off.src = "images/whatare_off.gif";
				button3_off = new Image();
				button3_off.src = "images/howcani_off.gif";
		}

function on(imgName)
{ if (document.images)
		{ document[imgName].src = eval(imgName + "_on.src"); }
		}

function off(imgName)
{ if (document.images)
		{ document[imgName].src = eval(imgName + "_off.src"); }
		}

onerror=null;


//launches each pop up window
function launchdemo() {
   win = window.open("demo/index.html","demo","toolbar=no,width=820,height=640,directories=no,status=no,scrollbars=no,resize=no,menubar=no,location=no,copyhistory=no");
  if (navigator.userAgent.substring(0,9) >= "Mozilla/4") {
     win.moveTo((10), (10));
  }
  win.focus();
}