if (!loc) loc="";
	    
	    var btn1 = new Image();
	    var btn1_on = new Image();
	    var btn2 = new Image();
	    var btn2_on = new Image();
	    var btn3 = new Image();
	    var btn3_on = new Image();
	    var btn4 = new Image();
	    var btn4_on = new Image();
	    var btn5 = new Image();
	    var btn5_on = new Image();
	    var btn6 = new Image();
	    var btn6_on = new Image();
	    var btn7 = new Image();
	    var btn7_on = new Image();
	    var btn8 = new Image();
	    var btn8_on = new Image();
	    
	    btn1.src = "img/btn1" + loc + ".gif";
	    btn1_on.src = "img/btn1_on" + loc + ".gif";
	    btn2.src = "img/btn2" + loc + ".gif";
	    btn2_on.src = "img/btn2_on" + loc + ".gif";
	    btn3.src = "img/btn3" + loc + ".gif";
	    btn3_on.src = "img/btn3_on" + loc + ".gif";
	    btn4.src = "img/btn4" + loc + ".gif";
	    btn4_on.src = "img/btn4_on" + loc + ".gif";
	    btn5.src = "img/btn5" + loc + ".gif";
	    btn5_on.src = "img/btn5_on" + loc + ".gif";
	    btn6.src = "img/btn6" + loc + ".gif";
	    btn6_on.src = "img/btn6_on" + loc + ".gif";
	    btn7.src = "img/btn7" + loc + ".gif";
	    btn7_on.src = "img/btn7_on" + loc + ".gif";
	    btn8.src = "img/btn8" + loc + ".gif";
	    btn8_on.src = "img/btn8_on" + loc + ".gif";
    
  function ShowImage(imgobj,newimg) {
     imgobj.src = newimg.src
  }
  
  function OpenNewWin(URL,w,h) {
  	  self.open(URL,null,'location=no,menubar=no,scrollbars=no,width='+w+',height='+h);
  }
  
  function OpenFullWin(URL) {
  	  self.open(URL,'','fullscreen=yes');
  }

  function StartPresentation() {
     self.open('demo/html-presentation.htm',null,'width=680,height=510,location=no,statusbar=no');
  }