function show_nav(input_name){
	nav_array = new Array('index', 'aboutus', 'security', 'monitoring', 'automation', 'audio', 'vac', 'theater');
	out_array = new Array();
	img_array = new Array();

	for (i = 0; i < nav_array.length; i++){
		if (input_name == nav_array[i]){
			out_array[i] = nav_array[i] + '_on';
			img_array[i] = nav_array[i] + '_on';
		} else {
			out_array[i] = nav_array[i] + '_off';
			img_array[i] = nav_array[i] + '_off';
		}

//		var target = ' target="_top"';
		var target = '';
		var link = nav_array[i] + '.html';

		if (input_name == nav_array[i]){
			document.write('<a href="' + link + '"' + target + '><img src="gfx/nav_' + img_array[i] + '.gif" name="' + nav_array[i] + '" height="20" border="0"></a>');
		} else {
			document.write('<a href="' + link + '" ONMOUSEOVER="imageChange(\'nav_' + nav_array[i] + '_on.gif\', \'' + nav_array[i] + '\')" ONMOUSEOUT="imageChange(\'nav_' + out_array[i] + '.gif\', \'' + nav_array[i] + '\')" ' + target + '><img src="gfx/nav_' + img_array[i] + '.gif" name="' + nav_array[i] + '" height="20" border="0"></a>');
		}
	}
}

function pre_load(){
	image1 = new Image();
	image1.src = "gfx/nav_about_off.gif";
	
	image2 = new Image();
	image2.src = "gfx/nav_audio_off.gif";
	
	image3 = new Image();
	image3.src = "gfx/nav_automation_off.gif";
	
	image4 = new Image();
	image4.src = "gfx/nav_index_off.gif";
	
	image5 = new Image();
	image5.src = "gfx/nav_monitoring_off.gif";
	
	image6 = new Image();
	image6.src = "gfx/nav_security_off.gif";
	
	image7 = new Image();
	image7.src = "gfx/nav_theater_off.gif";
	
	image8 = new Image();
	image8.src = "gfx/nav_vac_off.gif";
}