var ua = navigator.userAgent.toLowerCase(); 
this.ua = ua;		
this.macIE = ( (ua.indexOf("msie") != -1) && (ua.indexOf('mac') != -1) ); 
if (this.macIE) {
	document.write("<link rel='stylesheet' href='mac.css' type='text/css' media='screen' />");
}


/*imgsplash = new Image();
imgsplash.src = "images/pagesplash.jpg";

imgmain = new Image();
imgmain.src = "images/pagemain.jpg"

imgabout = new Image();
imgabout.src = "images/pageaboutbrazil.jpg"

imgservices = new Image();
imgservices.src = "images/pageservices.jpg"

imgcurrent = new Image();
imgcurrent.src = "images/pagecurrentprojects.jpg"

imgexperience = new Image();
imgexperience.src = "images/pageexperience.jpg"

imgcontact = new Image();
imgcontact.src = "images/pagecontact.jpg"*/

//dan's layer script
// Declared at top of the page where invoked
//var numberOfLayers = 3;

var layerShowing = 1;

/*function showLayerNumber(number){
	var layerNumberToShow = number;
	hideLayer(eval('"layer' + layerShowing + '"'));
	showLayer(eval('"layer' + layerNumberToShow +'"'));
	layerShowing = layerNumberToShow;
}*/

function showPreviousLayer(){
	var layerNumToShow = layerShowing - 1;
	if (layerNumToShow <2 ){
		document.getElementById("loopControlPrev").style.visibility="hidden"; 
		document.getElementById("loopControlNext").style.visibility="visible";}
	else if (layerNumToShow > 1 && layerNumToShow <= numberOfLayers){
		document.getElementById("loopControlNext").style.visibility="visible";}
	hideLayer(eval('"layer' + layerShowing + '"'));
	showLayer(eval('"layer' + layerNumToShow +'"'));
	layerShowing = layerNumToShow; 	}

function showNextLayer(){
	var layerNumToShow = layerShowing + 1;
	if (layerNumToShow > numberOfLayers -1){
		document.getElementById("loopControlNext").style.visibility="hidden";
		document.getElementById("loopControlPrev").style.visibility="visible";}  
	else if (layerNumToShow > 1 && layerNumToShow <= numberOfLayers){
		document.getElementById("loopControlPrev").style.visibility="visible";}
	else if (layerNumToShow = 1){
		document.getElementById("loopControlPrev").style.visibility="hidden";
		document.getElementById("loopControlNext").style.visibility="visible";}
	hideLayer(eval('"layer' + layerShowing +'"'));
	showLayer(eval('"layer' + layerNumToShow +'"'));
	layerShowing = layerNumToShow; 	}
	
function showLayer(layerName){
	document.getElementById(layerName).style.display="block"; 	}

function hideLayer(layerName){
		document.getElementById(layerName).style.display = "none"; }