function nextInstallation( brandName, imagesCount ){
	var image1 = document.getElementById( "image1" );
	var image2 = document.getElementById( "image2" );
	var srcString = image1.src;
	var installationTitle = document.getElementById( "installationTitle" );
	
	var imageNr = parseInt(srcString.substring(srcString.length-6,srcString.length-4)) + 1;
	if( imageNr == 1 )
		imageNr = parseInt(srcString.substring(srcString.length-5,srcString.length-4)) + 1;
	
	if( imageNr < 4 || imageNr >= 14 ){
		installationTitle.innerHTML = "Exposi&ccedil;&atilde;o";
	}
	else if( imageNr >= 4 && imageNr < 7 ){
		installationTitle.innerHTML = "Armaz&eacute;m";
	}
	else if( imageNr >= 8  && imageNr < 10  ){
		installationTitle.innerHTML = "Produ&ccedil;&atilde;o";
	}
	else if( imageNr >= 11 ){
		installationTitle.innerHTML = "Escritorio";
	}
	if( imageNr > imagesCount )
		imageNr = 1;
	image1.src = "imagens/instalacoes/" + brandName + "0" + imageNr + ".jpg";
	
	if( imageNr+1 > imagesCount )
		imageNr = 0;
	image2.src = "imagens/instalacoes/" + brandName + "0" + (imageNr+1) + ".jpg";	
	
}

function prevInstallation( brandName, imagesCount ){
	
	var image1 = document.getElementById( "image1" );
	var image2 = document.getElementById( "image2" );
	var srcString = image1.src;
	var installationTitle = document.getElementById( "installationTitle" );
	
	var imageNr = parseInt(srcString.substring(srcString.length-6,srcString.length-4)) - 1;
	if( imageNr == -1 )
		imageNr = parseInt(srcString.substring(srcString.length-5,srcString.length-4)) - 1;
	
	if( (imageNr < 4 && imageNr > 0) || imageNr >= 14 ){
		installationTitle.innerHTML = "Exposi&ccedil;&atilde;o";
	}
	else if( imageNr >= 4 && imageNr < 7 ){
		installationTitle.innerHTML = "Armaz&eacute;m";
	}
	else if( imageNr >= 8 && imageNr < 10 ){
		installationTitle.innerHTML = "Produ&ccedil;&atilde;o";
	}
	else if( imageNr >= 11 || imageNr <= 0 ){
		installationTitle.innerHTML = "Escritorio";
	}
	
	
	image2.src = "imagens/instalacoes/" + brandName + "0" + (imageNr+1) + ".jpg";
	
	if( imageNr < 1 )
		imageNr = imagesCount;
	image1.src = "imagens/instalacoes/" + brandName + "0" + imageNr + ".jpg";
	
	
	
}