var IElayers;
if (document.all) { IElayers = 0;}
else if (document.layers) { IElayers = 1; }
else if (!document.all && document.getElementById) { IElayers = 2; }
var currentLayer = "";
var currentSubLayer = "";
var currentFeature = "";
var notLoaded=true;
envLoaded = false;

function show(id,reset) {
	if (notLoaded!=true) { 
		if (currentLayer != "") { hide(currentLayer); }
		if (IElayers == 2) {
			document.getElementById(id).style.visibility = "visible";
			}
		else if (IElayers == 1) {
			document.layers[id].visibility = "show";
			}
		else if (IElayers == 0) {
			document.all[id].style.visibility = "visible";
			}
		if (reset=="yes") {
			if (IElayers == 2) {
				document.getElementById("menuReset").style.visibility = "visible";
				}
			else if (IElayers == 1) {
				document.layers["menuReset"].visibility = "show";
				}
			else if (IElayers == 0) {
				document.all["menuReset"].style.visibility = "visible";
				}
		}
        currentLayer = id;
	}
}

function hide(id) {
	if (notLoaded!=true) { 
		if (IElayers == 2) {
			document.getElementById(id).style.visibility = "hidden";
			}
		else if (IElayers == 1) {
			document.layers[id].visibility = "hide";
			}
		else if (IElayers == 0) {
			document.all[id].style.visibility = "hidden";
			}
	}
}

function hideMenus() {
	if (notLoaded!=true) { 
	if (currentLayer!="") { hide(currentLayer); }
	if (currentSubLayer!="") { hide(currentSubLayer); }
	hide("menuReset");
	currentLayer="";
	currentSubLayer="";
	}
}
	
function showMenu(id,reset) {
	if (notLoaded!=true) { 
		if (currentLayer != "") { hide(currentLayer); }
		if (IElayers == 2) {
			document.getElementById(id).style.visibility = "visible";
			}
		else if (IElayers == 1) {
			document.layers[id].visibility = "show";
			}
		else if (IElayers == 0) {
			document.all[id].style.visibility = "visible";
			}
		if (reset=="yes") {
			if (IElayers == 2) {
				document.getElementById("menuReset").style.visibility = "visible";
				}
			else if (IElayers == 1) {
				document.layers["menuReset"].visibility = "show";
				}
			else if (IElayers == 0) {
				document.all["menuReset"].style.visibility = "visible";
				}
		}
        currentLayer = id;
	}
}

/*
submenu functions not used...

function hideSubMenus() {
	if (notLoaded!=true) { 
	if (currentSubLayer!="") { hide(currentSubLayer); }
	currentSubLayer="";
	}
}

function showSubMenu(id,reset) {
	if (notLoaded!=true) { 
		if (currentSubLayer != "") { hide(currentSubLayer); }
		if (IElayers == 2) {
			document.getElementById(id).style.visibility = "visible";
			document.getElementById(id).style.visibility = "visible";
			}
		else if (IElayers == 1) {
			document.layers[id].visibility = "show";
			document.layers[id].visibility = "show";
			}
		else if (IElayers == 0) {
			document.all[id].style.visibility = "visible";
			document.all[id].style.visibility = "visible";
			}
		if (reset=="yes") {
			if (IElayers == 2) {
				document.getElementById("menuReset").style.visibility = "visible";
				document.getElementById("menuReset").style.visibility = "visible";
				}
			else if (IElayers == 1) {
				document.layers["menuReset"].visibility = "show";
				document.layers["menuReset"].visibility = "show";
				}
			else if (IElayers == 0) {
				document.all["menuReset"].style.visibility = "visible";
				document.all["menuReset"].style.visibility = "visible";
				}
		}
        currentSubLayer = id;
	}
}
*/

function switchPic(bName,whatAction){
	if (envLoaded) {
//		alert("switch pic initiated, envLoaded=" + envLoaded + " , bName=" + bName + ", whatAction=" + whatAction);
		buttonName = bName + "_" + whatAction;
		document.images[bName].src = eval(buttonName + ".src");
		}
	}

function envInit(){
		b1_on = new Image(100,22);
		b1_on.src = "gfx/b_home_on.gif";
		b1_off = new Image(100,22);
		b1_off.src = "gfx/b_home_off.gif";
	
		b2_on = new Image(90,22);
		b2_on.src = "gfx/b_about_on.gif";
		b2_off = new Image(90,22);
		b2_off.src = "gfx/b_about_off.gif";
	
		b3_on = new Image(84,22);
		b3_on.src = "gfx/b_products_on.gif";
		b3_off = new Image(84,22);
		b3_off.src = "gfx/b_products_off.gif";

		centerOffsetLeftDiv('techMenu',0);
		centerOffsetLeftDiv('prodMenu',96);
		centerOffsetLeftDiv('aboutMenu',176);
		centerOffsetLeftDiv('menuReset',-20);
		envLoaded = true;
	}

notLoaded = false;

function centerOffsetLeftDiv(id,s_offset,mainCheck) {
	var screenWW = window.innerWidth || document.body.clientWidth;
	if (screenWW > 820) {
		calc_offset = ((screenWW - 800) / 2) + s_offset;
	} else {
		calc_offset = s_offset;
	}
//	alert ("id: " + id + ", calc_offset: " + calc_offset);
	if (IElayers == 2) {
		document.getElementById(id).style.left = calc_offset;
		}
	else if (IElayers == 1) {
		document.layers[id].left = calc_offset;
		}
	else if (IElayers == 0) {
		document.all[id].style.left = calc_offset;
		}
} // end func centerOffsetLeftDiv(id)

function new_captcha() {
	var randomnumber=Math.floor(Math.random()*1001)
	var capdiv = document.getElementById("imgCaptcha");
	capdiv.src = "/captcha_image.php?a=" + randomnumber;
}