// JavaScript Document
var btnCount = 7;
/*
function preloadImages(){
	if (document.images){
		  preload_image_object = new Image();
		  // set image url
		  image_url = new Array();
		  for(i=0; i<btnCount; i++){
			  image_url[]="image/btn/btn"+i+"_d.jpg"
		  }
		   var i = 0;
		   for(i=0; i<image_url.length; i++) {
			 preload_image_object.src = image_url[i];
		   }
	}
}
*/  
function resetBtn(){
	var imgSet="";
	for(i=0;i<btnCount;i++){
		if((i==btnDown)&&(btnDown!=false)){imgSet="_d";}else{imgSet="_o";}
		document.getElementById('btn'+i).src='images/btn/btn'+i+imgSet+'.jpg';
	}
}

function swapBtn(e){
	document.getElementById(e).src = "images/btn/"+e+"_d.jpg";	
}
function topNav(index){
	switch(index){
		case "btn0":url="electrical.php";break;
		case "btn1":url="lighting.php";break;
		case "btn2":url="consulting.php";break;
		case "btn3":url="emergency.php";break;
		case "btn4":url="fire.php";break;
		case "btn5":url="air.php";break;
		case "btn6":url="aboutus.php";break;
	}
	location.href = url;
}