<!-- Beginning of JavaScript -------------------
// Swapping Images
// Netscape 3.0 or higher and Internet Explorer 4.0 compatibility test (for javascript image swapping)

browserName = navigator.appName;
browserVer = parseInt(navigator.appVersion);
if ((browserName == "Netscape" && browserVer >= 3) ||
    (browserName == "Microsoft Internet Explorer" && browserVer >= 4))
      compat = true;
else 
	compat = false;


// Put images in cache for quick swapping
if( compat ){
		light_f = new Image;(29,30)
		light_f.src = "../image/light_f.gif";
		light_o = new Image;(29,30)
		light_o.src = "../image/light_o.gif";

		title = new Image;(171,100)
		title.src = "../image/techno_title_sm.gif";
		blank = new Image;(166,103)
		blank.src = "../image/blank.gif";

		button1_active = new Image;(89,30)
		button1_active.src = "../image/propulsion_act.gif";
		button1_inactive = new Image;(89,30)
		button1_inactive.src = "../image/propulsion.gif";

		button2_active = new Image;(89,30)
		button2_active.src = "../image/energy_act.gif";
		button2_inactive = new Image;(89,30)
		button2_inactive.src = "../image/energy.gif";

		button3_active = new Image;(89,30)
		button3_active.src = "../image/computer_act.gif";
		button3_inactive = new Image;(89,30)
		button3_inactive.src = "../image/computer.gif";

		button4_active = new Image;(89,30)
		button4_active.src = "../image/aliens_act.gif";
		button4_inactive = new Image;(89,30)
		button4_inactive.src = "../image/aliens.gif";

		button5_active = new Image;(89,30)
		button5_active.src = "../image/spacetime_act.gif";
		button5_inactive = new Image;(89,30)
		button5_inactive.src = "../image/spacetime.gif";

		button6_active = new Image;(89,30)
		button6_active.src = "../image/gravity_act.gif";
		button6_inactive = new Image;(89,30)
		button6_inactive.src = "../image/gravity.gif";

		button7_active = new Image;(89,30)
		button7_active.src = "../image/gadget_act.gif";
		button7_inactive = new Image;(89,30)
		button7_inactive.src = "../image/gadget.gif";

		button8_active = new Image;(89,30)
		button8_active.src = "../image/medical_act.gif";
		button8_inactive = new Image;(89,30)
		button8_inactive.src = "../image/medical.gif";

		c0= new Image;(30,30)
		c0.src = "../image/c0.gif";
		
		c1= new Image;(16,30)
		c1.src = "../image/c1.gif";

		c2= new Image;(16,30)
		c2.src = "../image/c2.gif";

		c3= new Image;(16,30)
		c3.src = "../image/c3.gif";

		c4= new Image;(16,30)
		c4.src = "../image/c4.gif";

}

// swap images using the cached images
function swapImg(imgName, sourceName){
   if( compat ) { 
   		document.images[imgName].src=eval(sourceName+'.src');
   		}

}

// Updating indicators

function updateIndicator(num){
				
	for ( x =1; x < 9; x++) {
		swapImg ('indicator' + x, 'light_f');
		}

	if (num ==0) {
			swapImg ('status', 'blank');
			removeCon();
		}
	else {
		swapImg( 'status', 'title');		
		swapImg( 'indicator'+num, 'light_o');
		con(num);
	}
	
}

function con (num)
{
	removeCon();

	for ( x =1; x < num; x++) {
		swapImg ('con' + x, 'c3');
		}
	swapImg( 'con' + num, 'c4');

}

function removeCon ()
{
	for ( x =1; x <= 8; x++) {
		swapImg ('con' + x, 'c0');
		}

}


// -- End of JavaScript code -------------- -->